tempest cleanup should use keystone v3 client

tempest cleanup returns an error when it's initializing a saved
state, because it uses already deprecated v2 client.
The patch makes tempest cleanup use keystone role v3 client.

Related-prod: PROD-00000
Closes-Bug: #1788561

Change-Id: Id607dec012ce48af6d4c7ee263a90c3ea2e1799c
diff --git a/tempest/cmd/cleanup_service.py b/tempest/cmd/cleanup_service.py
index 3aed4e8..5d0da8d 100644
--- a/tempest/cmd/cleanup_service.py
+++ b/tempest/cmd/cleanup_service.py
@@ -833,7 +833,7 @@
 
     def __init__(self, manager, **kwargs):
         super(RoleService, self).__init__(kwargs)
-        self.client = manager.roles_client
+        self.client = manager.roles_v3_client
 
     def list(self):
         try: