diff --git a/tempest/test.py b/tempest/test.py
index 5898358..3052f55 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -270,7 +270,7 @@
                                                    level=None))
 
     @classmethod
-    def get_client_manager(cls):
+    def get_client_manager(cls, interface=None):
         """
         Returns an Openstack client manager
         """
@@ -282,12 +282,27 @@
             force_tenant_isolation):
             creds = cls.isolated_creds.get_primary_creds()
             username, tenant_name, password = creds
-            os = clients.Manager(username=username,
-                                 password=password,
-                                 tenant_name=tenant_name,
-                                 interface=cls._interface)
+            if getattr(cls, '_interface', None):
+                os = clients.Manager(username=username,
+                                     password=password,
+                                     tenant_name=tenant_name,
+                                     interface=cls._interface)
+            elif interface:
+                os = clients.Manager(username=username,
+                                     password=password,
+                                     tenant_name=tenant_name,
+                                     interface=interface)
+            else:
+                os = clients.Manager(username=username,
+                                     password=password,
+                                     tenant_name=tenant_name)
         else:
-            os = clients.Manager(interface=cls._interface)
+            if getattr(cls, '_interface', None):
+                os = clients.Manager(interface=cls._interface)
+            elif interface:
+                os = clients.Manager(interface=interface)
+            else:
+                os = clients.Manager()
         return os
 
     @classmethod
diff --git a/tempest/thirdparty/boto/test.py b/tempest/thirdparty/boto/test.py
index d484d94..b36e8c7 100644
--- a/tempest/thirdparty/boto/test.py
+++ b/tempest/thirdparty/boto/test.py
@@ -195,6 +195,7 @@
     def setUpClass(cls):
         super(BotoTestCase, cls).setUpClass()
         cls.conclusion = decision_maker()
+        cls.os = cls.get_client_manager()
         # The trash contains cleanup functions and paramaters in tuples
         # (function, *args, **kwargs)
         cls._resource_trash_bin = {}
@@ -259,6 +260,7 @@
                 LOG.exception("Cleanup failed %s" % func_name)
             finally:
                 del cls._resource_trash_bin[key]
+        cls.clear_isolated_creds()
         super(BotoTestCase, cls).tearDownClass()
         # NOTE(afazekas): let the super called even on exceptions
         # The real exceptions already logged, if the super throws another,
diff --git a/tempest/thirdparty/boto/test_ec2_instance_run.py b/tempest/thirdparty/boto/test_ec2_instance_run.py
index 19ddd18..a6932bc 100644
--- a/tempest/thirdparty/boto/test_ec2_instance_run.py
+++ b/tempest/thirdparty/boto/test_ec2_instance_run.py
@@ -15,7 +15,6 @@
 
 from boto import exception
 
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest.common.utils.linux.remote_client import RemoteClient
 from tempest import config
@@ -41,7 +40,6 @@
         if not cls.conclusion['A_I_IMAGES_READY']:
             raise cls.skipException("".join(("EC2 ", cls.__name__,
                                     ": requires ami/aki/ari manifest")))
-        cls.os = clients.Manager()
         cls.s3_client = cls.os.s3_client
         cls.ec2_client = cls.os.ec2api_client
         cls.zone = cls.ec2_client.get_good_zone()
diff --git a/tempest/thirdparty/boto/test_ec2_keys.py b/tempest/thirdparty/boto/test_ec2_keys.py
index b4c1827..329ace3 100644
--- a/tempest/thirdparty/boto/test_ec2_keys.py
+++ b/tempest/thirdparty/boto/test_ec2_keys.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest.test import attr
 from tempest.test import skip_because
@@ -30,7 +29,6 @@
     @classmethod
     def setUpClass(cls):
         super(EC2KeysTest, cls).setUpClass()
-        cls.os = clients.Manager()
         cls.client = cls.os.ec2api_client
         cls.ec = cls.ec2_error_code
 
diff --git a/tempest/thirdparty/boto/test_ec2_network.py b/tempest/thirdparty/boto/test_ec2_network.py
index 3c3c74d..4b2f01f 100644
--- a/tempest/thirdparty/boto/test_ec2_network.py
+++ b/tempest/thirdparty/boto/test_ec2_network.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest import clients
 from tempest.test import attr
 from tempest.test import skip_because
 from tempest.thirdparty.boto.test import BotoTestCase
@@ -24,7 +23,6 @@
     @classmethod
     def setUpClass(cls):
         super(EC2NetworkTest, cls).setUpClass()
-        cls.os = clients.Manager()
         cls.client = cls.os.ec2api_client
 
     # Note(afazekas): these tests for things duable without an instance
diff --git a/tempest/thirdparty/boto/test_ec2_security_groups.py b/tempest/thirdparty/boto/test_ec2_security_groups.py
index 75dd254..9b58603 100644
--- a/tempest/thirdparty/boto/test_ec2_security_groups.py
+++ b/tempest/thirdparty/boto/test_ec2_security_groups.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest.test import attr
 from tempest.thirdparty.boto.test import BotoTestCase
@@ -24,7 +23,6 @@
     @classmethod
     def setUpClass(cls):
         super(EC2SecurityGroupTest, cls).setUpClass()
-        cls.os = clients.Manager()
         cls.client = cls.os.ec2api_client
 
     @attr(type='smoke')
diff --git a/tempest/thirdparty/boto/test_ec2_volumes.py b/tempest/thirdparty/boto/test_ec2_volumes.py
index 3e7e2de..04671c5 100644
--- a/tempest/thirdparty/boto/test_ec2_volumes.py
+++ b/tempest/thirdparty/boto/test_ec2_volumes.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest import clients
 from tempest.openstack.common import log as logging
 from tempest.test import attr
 from tempest.thirdparty.boto.test import BotoTestCase
@@ -31,7 +30,6 @@
     @classmethod
     def setUpClass(cls):
         super(EC2VolumesTest, cls).setUpClass()
-        cls.os = clients.Manager()
         cls.client = cls.os.ec2api_client
         cls.zone = cls.client.get_good_zone()
 
diff --git a/tempest/thirdparty/boto/test_s3_buckets.py b/tempest/thirdparty/boto/test_s3_buckets.py
index f8948fd..f34faac 100644
--- a/tempest/thirdparty/boto/test_s3_buckets.py
+++ b/tempest/thirdparty/boto/test_s3_buckets.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest.test import attr
 from tempest.test import skip_because
@@ -25,7 +24,6 @@
     @classmethod
     def setUpClass(cls):
         super(S3BucketsTest, cls).setUpClass()
-        cls.os = clients.Manager()
         cls.client = cls.os.s3_client
 
     @skip_because(bug="1076965")
diff --git a/tempest/thirdparty/boto/test_s3_ec2_images.py b/tempest/thirdparty/boto/test_s3_ec2_images.py
index 722577b..9607a92 100644
--- a/tempest/thirdparty/boto/test_s3_ec2_images.py
+++ b/tempest/thirdparty/boto/test_s3_ec2_images.py
@@ -15,7 +15,6 @@
 
 import os
 
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest import config
 from tempest.test import attr
@@ -33,7 +32,6 @@
         if not cls.conclusion['A_I_IMAGES_READY']:
             raise cls.skipException("".join(("EC2 ", cls.__name__,
                                     ": requires ami/aki/ari manifest")))
-        cls.os = clients.Manager()
         cls.s3_client = cls.os.s3_client
         cls.images_client = cls.os.ec2api_client
         cls.materials_path = CONF.boto.s3_materials_path
diff --git a/tempest/thirdparty/boto/test_s3_objects.py b/tempest/thirdparty/boto/test_s3_objects.py
index f355899..a102a22 100644
--- a/tempest/thirdparty/boto/test_s3_objects.py
+++ b/tempest/thirdparty/boto/test_s3_objects.py
@@ -17,7 +17,6 @@
 
 import boto.s3.key
 
-from tempest import clients
 from tempest.common.utils import data_utils
 from tempest.test import attr
 from tempest.thirdparty.boto.test import BotoTestCase
@@ -28,7 +27,6 @@
     @classmethod
     def setUpClass(cls):
         super(S3BucketsTest, cls).setUpClass()
-        cls.os = clients.Manager()
         cls.client = cls.os.s3_client
 
     @attr(type='smoke')