Split resource_setup for telemetry tests

Split up the resource_setup method for all the telemetry tests, as per the
latest spec.
Partially-implements bp:resource-cleanup

Change-Id: I3d5af988c28bc7d80d2aabf9327e9abf588a2403
diff --git a/tempest/api/telemetry/base.py b/tempest/api/telemetry/base.py
index 7ec0646..c521b37 100644
--- a/tempest/api/telemetry/base.py
+++ b/tempest/api/telemetry/base.py
@@ -28,18 +28,29 @@
     """Base test case class for all Telemetry API tests."""
 
     @classmethod
-    def resource_setup(cls):
+    def skip_checks(cls):
+        super(BaseTelemetryTest, cls).skip_checks()
         if not CONF.service_available.ceilometer:
             raise cls.skipException("Ceilometer support is required")
-        cls.set_network_resources()
-        super(BaseTelemetryTest, cls).resource_setup()
-        os = cls.get_client_manager()
-        cls.telemetry_client = os.telemetry_client
-        cls.servers_client = os.servers_client
-        cls.flavors_client = os.flavors_client
-        cls.image_client = os.image_client
-        cls.image_client_v2 = os.image_client_v2
 
+    @classmethod
+    def setup_credentials(cls):
+        cls.set_network_resources()
+        super(BaseTelemetryTest, cls).setup_credentials()
+        cls.os = cls.get_client_manager()
+
+    @classmethod
+    def setup_clients(cls):
+        super(BaseTelemetryTest, cls).setup_clients()
+        cls.telemetry_client = cls.os.telemetry_client
+        cls.servers_client = cls.os.servers_client
+        cls.flavors_client = cls.os.flavors_client
+        cls.image_client = cls.os.image_client
+        cls.image_client_v2 = cls.os.image_client_v2
+
+    @classmethod
+    def resource_setup(cls):
+        super(BaseTelemetryTest, cls).resource_setup()
         cls.nova_notifications = ['memory', 'vcpus', 'disk.root.size',
                                   'disk.ephemeral.size']
 
diff --git a/tempest/api/telemetry/test_telemetry_notification_api.py b/tempest/api/telemetry/test_telemetry_notification_api.py
index 048e305..a0256af 100644
--- a/tempest/api/telemetry/test_telemetry_notification_api.py
+++ b/tempest/api/telemetry/test_telemetry_notification_api.py
@@ -23,11 +23,11 @@
 class TelemetryNotificationAPITestJSON(base.BaseTelemetryTest):
 
     @classmethod
-    def resource_setup(cls):
+    def skip_checks(cls):
+        super(TelemetryNotificationAPITestJSON, cls).skip_checks()
         if CONF.telemetry.too_slow_to_test:
             raise cls.skipException("Ceilometer feature for fast work mysql "
                                     "is disabled")
-        super(TelemetryNotificationAPITestJSON, cls).resource_setup()
 
     @test.attr(type="gate")
     @testtools.skipIf(not CONF.service_available.nova,