Poll for no servers in autoscaling test

Heat treats server in DELETED state as deleted,
which leaves for a (rare) possibility to still find
a non-empty list of servers in the end of this test.

Poll for half a minute for no servers in the server list,
and use detailed server list API to have a better picture of
what was server status if this check does nevertheless finds
any servers and fails.

Related-Issue: PRODX-54144
Change-Id: Ia2d859843017e331d4ad0a2f97d0be5302208dec
diff --git a/telemetry_tempest_plugin/scenario/telemetry_integration_gabbits/autoscaling_smoke.yaml b/telemetry_tempest_plugin/scenario/telemetry_integration_gabbits/autoscaling_smoke.yaml
index 2868b8b..29c7112 100644
--- a/telemetry_tempest_plugin/scenario/telemetry_integration_gabbits/autoscaling_smoke.yaml
+++ b/telemetry_tempest_plugin/scenario/telemetry_integration_gabbits/autoscaling_smoke.yaml
@@ -147,7 +147,10 @@
 
     - name: list servers deleted
       desc: List servers, no more exists
-      url: $ENVIRON['NOVA_SERVICE_URL']/servers
+      url: $ENVIRON['NOVA_SERVICE_URL']/servers/detail
       method: GET
+      poll:
+          count: 6
+          delay: 5
       response_json_paths:
           $.servers: []