Fix resource_cleanup function

Tempest itself delete the projects in case of dynamic credentials

Change-Id: I6e1ae616a909b99364a30419093bedad80d63479
Closes-bug: PROD-24672
diff --git a/tungsten_tempest_plugin/tests/api/contrail/rbac_base.py b/tungsten_tempest_plugin/tests/api/contrail/rbac_base.py
index 2685c39..4067cfd 100644
--- a/tungsten_tempest_plugin/tests/api/contrail/rbac_base.py
+++ b/tungsten_tempest_plugin/tests/api/contrail/rbac_base.py
@@ -397,10 +397,6 @@
 
     @classmethod
     def resource_cleanup(cls):
-        if CONF.auth.use_dynamic_credentials:
-            cls._try_delete_resource(cls.project_client.delete_project,
-                                     cls.project_uuid)
-
         super(BaseContrailTest, cls).resource_cleanup()
 
     @classmethod