Poll multiple times for deleted resources.

Autoscaling scenario currently sometimes fails, because there
is still a server running after deleting the stack. Poll for
the servers multiple times to give them enough time to get
deleted.

Change-Id: Ia16a9768bfeb07ecb1f795cc1f75e4da49cd73e4

telemetry_tempest_plugin/scenario/telemetry_integration_gabbits/autoscaling.yaml

@@ -152,6 +152,9 @@ tests:
       desc: List alarms, no more exist
       url: $ENVIRON['AODH_SERVICE_URL']/v2/alarms
       method: GET
+      poll:
+          count: 30
+          delay: 2
       response_strings:
           - "[]"
 
@@ -159,5 +162,8 @@ tests:
       desc: List servers, no more exists
       url: $ENVIRON['NOVA_SERVICE_URL']/servers
       method: GET
+      poll:
+          count: 30
+          delay: 2
       response_strings:
           - "[]"

telemetry_tempest_plugin/scenario/telemetry_integration_prometheus_gabbits/autoscaling.yaml

@@ -151,6 +151,9 @@ tests:
       desc: List alarms, no more exist
       url: $ENVIRON['AODH_SERVICE_URL']/v2/alarms
       method: GET
+      poll:
+          count: 30
+          delay: 2
       response_strings:
           - "[]"
 
@@ -158,5 +161,8 @@ tests:
       desc: List servers, no more exists
       url: $ENVIRON['NOVA_SERVICE_URL']/servers
       method: GET
+      poll:
+          count: 30
+          delay: 2
       response_strings:
           - "[]"