Wait for servers termination when cleaning up telemetry test

Closes-Bug: #1534928
Change-Id: Id33b9e1ade1675f1efbae96b7ea7430e46c4cdd7
diff --git a/tempest/api/telemetry/base.py b/tempest/api/telemetry/base.py
index bbf6db2..ff06810 100644
--- a/tempest/api/telemetry/base.py
+++ b/tempest/api/telemetry/base.py
@@ -17,6 +17,7 @@
 
 from tempest.common import compute
 from tempest.common.utils import data_utils
+from tempest.common import waiters
 from tempest import config
 from tempest import exceptions
 import tempest.test
@@ -97,8 +98,14 @@
                 pass
 
     @classmethod
+    def wait_for_server_termination(cls, server_id):
+        waiters.wait_for_server_termination(cls.servers_client,
+                                            server_id)
+
+    @classmethod
     def resource_cleanup(cls):
         cls.cleanup_resources(cls.servers_client.delete_server, cls.server_ids)
+        cls.cleanup_resources(cls.wait_for_server_termination, cls.server_ids)
         cls.cleanup_resources(cls.image_client.delete_image, cls.image_ids)
         super(BaseTelemetryTest, cls).resource_cleanup()