diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 1d368af..a2d3877 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -553,6 +553,9 @@
 # The mask bits for tenant ipv4 subnets (integer value)
 #tenant_network_mask_bits=28
 
+# Allow the execution of IPv6 tests (boolean value)
+#ipv6_enabled=true
+
 # The cidr block to allocate tenant ipv6 subnets from (string
 # value)
 #tenant_network_v6_cidr=2003::/64
diff --git a/tempest/api/network/test_networks.py b/tempest/api/network/test_networks.py
index 9029b1f..aba2c8e 100644
--- a/tempest/api/network/test_networks.py
+++ b/tempest/api/network/test_networks.py
@@ -467,6 +467,14 @@
     _tenant_network_cidr = CONF.network.tenant_network_v6_cidr
     _tenant_network_mask_bits = CONF.network.tenant_network_v6_mask_bits
 
+    @classmethod
+    def setUpClass(cls):
+        super(NetworksIpV6TestJSON, cls).setUpClass()
+        if not CONF.network.ipv6_enabled:
+            cls.tearDownClass()
+            skip_msg = "IPv6 Tests are disabled."
+            raise cls.skipException(skip_msg)
+
 
 class NetworksIpV6TestXML(NetworksIpV6TestJSON):
     _interface = 'xml'
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index 5064f07..03dccd4 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -502,24 +502,6 @@
         raise NotImplementedError(message)
 
 
-class RestClientXML(RestClient):
-
-    # NOTE(vponomaryov): This is deprecated class
-    # and should be removed after excluding it
-    # from all service clients
-
-    TYPE = "xml"
-
-    def _parse_resp(self, body):
-        return xml_to_json(etree.fromstring(body))
-
-    def is_absolute_limit(self, resp, resp_body):
-        if (not isinstance(resp_body, collections.Mapping) or
-                'retry-after' not in resp):
-            return True
-        return 'exceed' in resp_body.get('message', 'blabla')
-
-
 class NegativeRestClient(RestClient):
     """
     Version of RestClient that does not raise exceptions.
diff --git a/tempest/config.py b/tempest/config.py
index a2d35a9..c92a04d 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -343,6 +343,9 @@
     cfg.IntOpt('tenant_network_mask_bits',
                default=28,
                help="The mask bits for tenant ipv4 subnets"),
+    cfg.BoolOpt('ipv6_enabled',
+                default=True,
+                help="Allow the execution of IPv6 tests"),
     cfg.StrOpt('tenant_network_v6_cidr',
                default="2003::/64",
                help="The cidr block to allocate tenant ipv6 subnets from"),
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index f56fc58..b4fb6ab 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -495,18 +495,32 @@
         Create a subnet for the given network within the cidr block
         configured for tenant networks.
         """
+
+        def cidr_in_use(cidr, tenant_id):
+            """
+            :return True if subnet with cidr already exist in tenant
+                False else
+            """
+            cidr_in_use = self._list_subnets(tenant_id=tenant_id, cidr=cidr)
+            return len(cidr_in_use) != 0
+
         tenant_cidr = netaddr.IPNetwork(CONF.network.tenant_network_cidr)
         result = None
         # Repeatedly attempt subnet creation with sequential cidr
         # blocks until an unallocated block is found.
         for subnet_cidr in tenant_cidr.subnet(
             CONF.network.tenant_network_mask_bits):
+            str_cidr = str(subnet_cidr)
+            if cidr_in_use(str_cidr, tenant_id=network.tenant_id):
+                continue
+
             body = dict(
                 subnet=dict(
+                    name=data_utils.rand_name(namestart),
                     ip_version=4,
                     network_id=network.id,
                     tenant_id=network.tenant_id,
-                    cidr=str(subnet_cidr),
+                    cidr=str_cidr,
                 ),
             )
             try:
@@ -519,7 +533,7 @@
         self.assertIsNotNone(result, 'Unable to allocate tenant network')
         subnet = net_common.DeletableSubnet(client=self.network_client,
                                             **result['subnet'])
-        self.assertEqual(subnet.cidr, str(subnet_cidr))
+        self.assertEqual(subnet.cidr, str_cidr)
         self.set_resource(data_utils.rand_name(namestart), subnet)
         return subnet
 
diff --git a/tempest/services/compute/xml/aggregates_client.py b/tempest/services/compute/xml/aggregates_client.py
index cf853ba..5b250ee 100644
--- a/tempest/services/compute/xml/aggregates_client.py
+++ b/tempest/services/compute/xml/aggregates_client.py
@@ -15,7 +15,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -26,7 +26,8 @@
 CONF = config.CONF
 
 
-class AggregatesClientXML(RestClientXML):
+class AggregatesClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(AggregatesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/availability_zone_client.py b/tempest/services/compute/xml/availability_zone_client.py
index 3d8ac8a..4d71186 100644
--- a/tempest/services/compute/xml/availability_zone_client.py
+++ b/tempest/services/compute/xml/availability_zone_client.py
@@ -15,14 +15,15 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class AvailabilityZoneClientXML(RestClientXML):
+class AvailabilityZoneClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(AvailabilityZoneClientXML, self).__init__(
diff --git a/tempest/services/compute/xml/certificates_client.py b/tempest/services/compute/xml/certificates_client.py
index 4ee10c4..24ffca8 100644
--- a/tempest/services/compute/xml/certificates_client.py
+++ b/tempest/services/compute/xml/certificates_client.py
@@ -14,13 +14,14 @@
 #    under the License.
 
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 
 CONF = config.CONF
 
 
-class CertificatesClientXML(RestClientXML):
+class CertificatesClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(CertificatesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/extensions_client.py b/tempest/services/compute/xml/extensions_client.py
index f97b64d..3e8254c 100644
--- a/tempest/services/compute/xml/extensions_client.py
+++ b/tempest/services/compute/xml/extensions_client.py
@@ -15,14 +15,15 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class ExtensionsClientXML(RestClientXML):
+class ExtensionsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(ExtensionsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/fixed_ips_client.py b/tempest/services/compute/xml/fixed_ips_client.py
index b89e096..0475530 100644
--- a/tempest/services/compute/xml/fixed_ips_client.py
+++ b/tempest/services/compute/xml/fixed_ips_client.py
@@ -14,7 +14,7 @@
 #    under the License.
 
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -23,7 +23,8 @@
 CONF = config.CONF
 
 
-class FixedIPsClientXML(RestClientXML):
+class FixedIPsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(FixedIPsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/flavors_client.py b/tempest/services/compute/xml/flavors_client.py
index 554b253..68a27c9 100644
--- a/tempest/services/compute/xml/flavors_client.py
+++ b/tempest/services/compute/xml/flavors_client.py
@@ -17,7 +17,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -33,7 +33,8 @@
     "http://docs.openstack.org/compute/ext/flavor_access/api/v2"
 
 
-class FlavorsClientXML(RestClientXML):
+class FlavorsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(FlavorsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/floating_ips_client.py b/tempest/services/compute/xml/floating_ips_client.py
index d6decf3..be54753 100644
--- a/tempest/services/compute/xml/floating_ips_client.py
+++ b/tempest/services/compute/xml/floating_ips_client.py
@@ -16,7 +16,7 @@
 from lxml import etree
 import urllib
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -27,7 +27,9 @@
 CONF = config.CONF
 
 
-class FloatingIPsClientXML(RestClientXML):
+class FloatingIPsClientXML(rest_client.RestClient):
+    TYPE = "xml"
+
     def __init__(self, auth_provider):
         super(FloatingIPsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
diff --git a/tempest/services/compute/xml/hosts_client.py b/tempest/services/compute/xml/hosts_client.py
index 13abe18..b74cd04 100644
--- a/tempest/services/compute/xml/hosts_client.py
+++ b/tempest/services/compute/xml/hosts_client.py
@@ -15,7 +15,7 @@
 import urllib
 
 from lxml import etree
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -24,7 +24,8 @@
 CONF = config.CONF
 
 
-class HostsClientXML(RestClientXML):
+class HostsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(HostsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/hypervisor_client.py b/tempest/services/compute/xml/hypervisor_client.py
index 3c1ef08..ecd7541 100644
--- a/tempest/services/compute/xml/hypervisor_client.py
+++ b/tempest/services/compute/xml/hypervisor_client.py
@@ -15,14 +15,15 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class HypervisorClientXML(RestClientXML):
+class HypervisorClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(HypervisorClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/images_client.py b/tempest/services/compute/xml/images_client.py
index 9f80c55..9d529be 100644
--- a/tempest/services/compute/xml/images_client.py
+++ b/tempest/services/compute/xml/images_client.py
@@ -17,7 +17,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest.common import waiters
 from tempest import config
 from tempest import exceptions
@@ -30,7 +30,8 @@
 CONF = config.CONF
 
 
-class ImagesClientXML(RestClientXML):
+class ImagesClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(ImagesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/instance_usage_audit_log_client.py b/tempest/services/compute/xml/instance_usage_audit_log_client.py
index baa6966..1cd8c07 100644
--- a/tempest/services/compute/xml/instance_usage_audit_log_client.py
+++ b/tempest/services/compute/xml/instance_usage_audit_log_client.py
@@ -15,14 +15,15 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class InstanceUsagesAuditLogClientXML(RestClientXML):
+class InstanceUsagesAuditLogClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(InstanceUsagesAuditLogClientXML, self).__init__(
diff --git a/tempest/services/compute/xml/interfaces_client.py b/tempest/services/compute/xml/interfaces_client.py
index 6155cd6..5df6187 100644
--- a/tempest/services/compute/xml/interfaces_client.py
+++ b/tempest/services/compute/xml/interfaces_client.py
@@ -17,7 +17,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -28,7 +28,8 @@
 CONF = config.CONF
 
 
-class InterfacesClientXML(RestClientXML):
+class InterfacesClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(InterfacesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/keypairs_client.py b/tempest/services/compute/xml/keypairs_client.py
index 5641251..fb498c0 100644
--- a/tempest/services/compute/xml/keypairs_client.py
+++ b/tempest/services/compute/xml/keypairs_client.py
@@ -16,7 +16,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -26,7 +26,8 @@
 CONF = config.CONF
 
 
-class KeyPairsClientXML(RestClientXML):
+class KeyPairsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(KeyPairsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/limits_client.py b/tempest/services/compute/xml/limits_client.py
index 61c434c..2327626 100644
--- a/tempest/services/compute/xml/limits_client.py
+++ b/tempest/services/compute/xml/limits_client.py
@@ -15,7 +15,7 @@
 
 from lxml import objectify
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 
 CONF = config.CONF
@@ -23,7 +23,8 @@
 NS = "{http://docs.openstack.org/common/api/v1.0}"
 
 
-class LimitsClientXML(RestClientXML):
+class LimitsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(LimitsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/quotas_client.py b/tempest/services/compute/xml/quotas_client.py
index 00c3275..eb287c2 100644
--- a/tempest/services/compute/xml/quotas_client.py
+++ b/tempest/services/compute/xml/quotas_client.py
@@ -15,7 +15,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -25,7 +25,8 @@
 CONF = config.CONF
 
 
-class QuotasClientXML(RestClientXML):
+class QuotasClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(QuotasClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/security_groups_client.py b/tempest/services/compute/xml/security_groups_client.py
index 947f6da..d53e8da 100644
--- a/tempest/services/compute/xml/security_groups_client.py
+++ b/tempest/services/compute/xml/security_groups_client.py
@@ -16,7 +16,7 @@
 from lxml import etree
 import urllib
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -28,7 +28,8 @@
 CONF = config.CONF
 
 
-class SecurityGroupsClientXML(RestClientXML):
+class SecurityGroupsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(SecurityGroupsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/servers_client.py b/tempest/services/compute/xml/servers_client.py
index a182d35..da01b83 100644
--- a/tempest/services/compute/xml/servers_client.py
+++ b/tempest/services/compute/xml/servers_client.py
@@ -19,7 +19,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest.common import waiters
 from tempest import config
 from tempest import exceptions
@@ -139,7 +139,8 @@
     return json
 
 
-class ServersClientXML(RestClientXML):
+class ServersClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(ServersClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/services_client.py b/tempest/services/compute/xml/services_client.py
index 5943ea9..d7b8a60 100644
--- a/tempest/services/compute/xml/services_client.py
+++ b/tempest/services/compute/xml/services_client.py
@@ -18,7 +18,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -27,7 +27,8 @@
 CONF = config.CONF
 
 
-class ServicesClientXML(RestClientXML):
+class ServicesClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(ServicesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/tenant_usages_client.py b/tempest/services/compute/xml/tenant_usages_client.py
index 96c3147..79f0ac9 100644
--- a/tempest/services/compute/xml/tenant_usages_client.py
+++ b/tempest/services/compute/xml/tenant_usages_client.py
@@ -17,14 +17,15 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class TenantUsagesClientXML(RestClientXML):
+class TenantUsagesClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(TenantUsagesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/compute/xml/volumes_extensions_client.py b/tempest/services/compute/xml/volumes_extensions_client.py
index a43fc21..570b715 100644
--- a/tempest/services/compute/xml/volumes_extensions_client.py
+++ b/tempest/services/compute/xml/volumes_extensions_client.py
@@ -18,7 +18,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -30,7 +30,8 @@
 CONF = config.CONF
 
 
-class VolumesExtensionsClientXML(RestClientXML):
+class VolumesExtensionsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(VolumesExtensionsClientXML, self).__init__(
diff --git a/tempest/services/identity/v3/xml/credentials_client.py b/tempest/services/identity/v3/xml/credentials_client.py
index f6fa678..22ed44d 100644
--- a/tempest/services/identity/v3/xml/credentials_client.py
+++ b/tempest/services/identity/v3/xml/credentials_client.py
@@ -17,7 +17,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -29,7 +29,8 @@
 XMLNS = "http://docs.openstack.org/identity/api/v3"
 
 
-class CredentialsClientXML(RestClientXML):
+class CredentialsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(CredentialsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/identity/v3/xml/endpoints_client.py b/tempest/services/identity/v3/xml/endpoints_client.py
index 2a88c15..a32eede 100644
--- a/tempest/services/identity/v3/xml/endpoints_client.py
+++ b/tempest/services/identity/v3/xml/endpoints_client.py
@@ -16,7 +16,7 @@
 from lxml import etree
 
 from tempest.common import http
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -27,7 +27,8 @@
 XMLNS = "http://docs.openstack.org/identity/api/v3"
 
 
-class EndPointClientXML(RestClientXML):
+class EndPointClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(EndPointClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/identity/v3/xml/identity_client.py b/tempest/services/identity/v3/xml/identity_client.py
index 5ae0461..e8e70d8 100644
--- a/tempest/services/identity/v3/xml/identity_client.py
+++ b/tempest/services/identity/v3/xml/identity_client.py
@@ -17,7 +17,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -30,7 +30,8 @@
 XMLNS = "http://docs.openstack.org/identity/api/v3"
 
 
-class IdentityV3ClientXML(RestClientXML):
+class IdentityV3ClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(IdentityV3ClientXML, self).__init__(auth_provider)
@@ -426,7 +427,8 @@
         return resp, body
 
 
-class V3TokenClientXML(RestClientXML):
+class V3TokenClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self):
         super(V3TokenClientXML, self).__init__(None)
diff --git a/tempest/services/identity/v3/xml/policy_client.py b/tempest/services/identity/v3/xml/policy_client.py
index a7e63a7..c12018a 100644
--- a/tempest/services/identity/v3/xml/policy_client.py
+++ b/tempest/services/identity/v3/xml/policy_client.py
@@ -16,7 +16,7 @@
 from lxml import etree
 
 from tempest.common import http
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -27,7 +27,8 @@
 XMLNS = "http://docs.openstack.org/identity/api/v3"
 
 
-class PolicyClientXML(RestClientXML):
+class PolicyClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(PolicyClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/identity/v3/xml/service_client.py b/tempest/services/identity/v3/xml/service_client.py
index be6c443..d5476c4 100644
--- a/tempest/services/identity/v3/xml/service_client.py
+++ b/tempest/services/identity/v3/xml/service_client.py
@@ -15,7 +15,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -26,7 +26,8 @@
 XMLNS = "http://docs.openstack.org/identity/api/v3"
 
 
-class ServiceClientXML(RestClientXML):
+class ServiceClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(ServiceClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/network/xml/network_client.py b/tempest/services/network/xml/network_client.py
index 5f3f8c1..f6ae718 100644
--- a/tempest/services/network/xml/network_client.py
+++ b/tempest/services/network/xml/network_client.py
@@ -13,7 +13,7 @@
 from lxml import etree
 import xml.etree.ElementTree as ET
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest.services.compute.xml.common import deep_dict_to_xml
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
@@ -23,13 +23,16 @@
 
 
 class NetworkClientXML(client_base.NetworkClientBase):
+    TYPE = "xml"
 
     # list of plurals used for xml serialization
     PLURALS = ['dns_nameservers', 'host_routes', 'allocation_pools',
                'fixed_ips', 'extensions', 'extra_dhcp_opts']
 
     def get_rest_client(self, auth_provider):
-        return RestClientXML(auth_provider)
+        rc = rest_client.RestClient(auth_provider)
+        rc.TYPE = self.TYPE
+        return rc
 
     def _parse_array(self, node):
         array = []
diff --git a/tempest/services/telemetry/xml/telemetry_client.py b/tempest/services/telemetry/xml/telemetry_client.py
index f29fe22..165f29a 100644
--- a/tempest/services/telemetry/xml/telemetry_client.py
+++ b/tempest/services/telemetry/xml/telemetry_client.py
@@ -15,16 +15,19 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import xml_to_json
 import tempest.services.telemetry.telemetry_client_base as client
 
 
 class TelemetryClientXML(client.TelemetryClientBase):
+    TYPE = "xml"
 
     def get_rest_client(self, auth_provider):
-        return RestClientXML(auth_provider)
+        rc = rest_client.RestClient(auth_provider)
+        rc.TYPE = self.TYPE
+        return rc
 
     def _parse_array(self, body):
         array = []
diff --git a/tempest/services/volume/v2/xml/volumes_client.py b/tempest/services/volume/v2/xml/volumes_client.py
index 69e3f5b..bc57842 100644
--- a/tempest/services/volume/v2/xml/volumes_client.py
+++ b/tempest/services/volume/v2/xml/volumes_client.py
@@ -18,7 +18,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -30,10 +30,11 @@
 CONF = config.CONF
 
 
-class VolumesV2ClientXML(RestClientXML):
+class VolumesV2ClientXML(rest_client.RestClient):
     """
     Client class to send CRUD Volume API requests to a Cinder endpoint
     """
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(VolumesV2ClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/volume/xml/admin/volume_hosts_client.py b/tempest/services/volume/xml/admin/volume_hosts_client.py
index 080e3d1..fb84c83 100644
--- a/tempest/services/volume/xml/admin/volume_hosts_client.py
+++ b/tempest/services/volume/xml/admin/volume_hosts_client.py
@@ -17,17 +17,18 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class VolumeHostsClientXML(RestClientXML):
+class VolumeHostsClientXML(rest_client.RestClient):
     """
     Client class to send CRUD Volume Hosts API requests to a Cinder endpoint
     """
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(VolumeHostsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/volume/xml/admin/volume_types_client.py b/tempest/services/volume/xml/admin/volume_types_client.py
index 802d27a..77bafec 100644
--- a/tempest/services/volume/xml/admin/volume_types_client.py
+++ b/tempest/services/volume/xml/admin/volume_types_client.py
@@ -17,7 +17,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -29,10 +29,11 @@
 CONF = config.CONF
 
 
-class VolumeTypesClientXML(RestClientXML):
+class VolumeTypesClientXML(rest_client.RestClient):
     """
     Client class to send CRUD Volume Types API requests to a Cinder endpoint
     """
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(VolumeTypesClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/volume/xml/backups_client.py b/tempest/services/volume/xml/backups_client.py
index 6a71f8b..81caaee 100644
--- a/tempest/services/volume/xml/backups_client.py
+++ b/tempest/services/volume/xml/backups_client.py
@@ -13,13 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.common.rest_client import RestClientXML
+from tempest.services.volume.json import backups_client
 
 
-class BackupsClientXML(RestClientXML):
+class BackupsClientXML(backups_client.BackupsClientJSON):
     """
     Client class to send CRUD Volume Backup API requests to a Cinder endpoint
     """
+    TYPE = "xml"
 
     #TODO(gfidente): XML client isn't yet implemented because of bug 1270589
     pass
diff --git a/tempest/services/volume/xml/extensions_client.py b/tempest/services/volume/xml/extensions_client.py
index 03743a6..1ea974f 100644
--- a/tempest/services/volume/xml/extensions_client.py
+++ b/tempest/services/volume/xml/extensions_client.py
@@ -15,14 +15,15 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest.services.compute.xml.common import xml_to_json
 
 CONF = config.CONF
 
 
-class ExtensionsClientXML(RestClientXML):
+class ExtensionsClientXML(rest_client.RestClient):
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(ExtensionsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/volume/xml/snapshots_client.py b/tempest/services/volume/xml/snapshots_client.py
index 9abe042..458001b 100644
--- a/tempest/services/volume/xml/snapshots_client.py
+++ b/tempest/services/volume/xml/snapshots_client.py
@@ -15,7 +15,7 @@
 
 from lxml import etree
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.openstack.common import log as logging
@@ -30,8 +30,9 @@
 LOG = logging.getLogger(__name__)
 
 
-class SnapshotsClientXML(RestClientXML):
+class SnapshotsClientXML(rest_client.RestClient):
     """Client class to send CRUD Volume API requests."""
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(SnapshotsClientXML, self).__init__(auth_provider)
diff --git a/tempest/services/volume/xml/volumes_client.py b/tempest/services/volume/xml/volumes_client.py
index 94c1ff6..aef1e3c 100644
--- a/tempest/services/volume/xml/volumes_client.py
+++ b/tempest/services/volume/xml/volumes_client.py
@@ -19,7 +19,7 @@
 from lxml import etree
 from xml.sax.saxutils import escape
 
-from tempest.common.rest_client import RestClientXML
+from tempest.common import rest_client
 from tempest import config
 from tempest import exceptions
 from tempest.services.compute.xml.common import Document
@@ -31,10 +31,11 @@
 CONF = config.CONF
 
 
-class VolumesClientXML(RestClientXML):
+class VolumesClientXML(rest_client.RestClient):
     """
     Client class to send CRUD Volume API requests to a Cinder endpoint
     """
+    TYPE = "xml"
 
     def __init__(self, auth_provider):
         super(VolumesClientXML, self).__init__(auth_provider)
diff --git a/tempest/stress/run_stress.py b/tempest/stress/run_stress.py
index 76320d0..a6c2b77 100755
--- a/tempest/stress/run_stress.py
+++ b/tempest/stress/run_stress.py
@@ -87,8 +87,13 @@
             # NOTE(mkoderer): we just save the last result code
             if (step_result != 0):
                 result = step_result
+                if ns.stop:
+                    return result
     else:
-        driver.stress_openstack(tests, ns.duration, ns.number, ns.stop)
+        result = driver.stress_openstack(tests,
+                                         ns.duration,
+                                         ns.number,
+                                         ns.stop)
     return result