Remove the unused tenant and user option in cleanup

Since I8c24cd17f643083dde71ab2bd2a38417c54aeccb , these options have
been removed and useless.So remove them.

Change-Id: I0c60c4bab9bfc97745a5e344656f78f8995aa1bd
Closes-Bug: #1599371
diff --git a/tempest/cmd/cleanup_service.py b/tempest/cmd/cleanup_service.py
index 8d2cfdc..426571f 100644
--- a/tempest/cmd/cleanup_service.py
+++ b/tempest/cmd/cleanup_service.py
@@ -67,11 +67,8 @@
     CONF_PRIV_NETWORK_NAME = CONF.compute.fixed_network_name
     CONF_PUB_NETWORK = CONF.network.public_network_id
     CONF_PUB_ROUTER = CONF.network.public_router_id
-    CONF_TENANTS = [CONF.auth.admin_project_name,
-                    CONF.identity.project_name,
-                    CONF.identity.alt_project_name]
-    CONF_USERS = [CONF.auth.admin_username, CONF.identity.username,
-                  CONF.identity.alt_username]
+    CONF_TENANTS = [CONF.auth.admin_project_name]
+    CONF_USERS = [CONF.auth.admin_username]
 
     if IS_NEUTRON:
         CONF_PRIV_NETWORK = _get_network_id(CONF.compute.fixed_network_name,