Update the service_token_roles_required to True for watcher

AuthToken middleware is set with
keystone_authtoken.service_token_roles_required set to False.
This is backwards compatible but deprecated behaviour.
This patch set it to True.

Change-Id: Id7df0b74a44753cd90359fd79caafd7acce9adb8

ansible/roles/watcher/templates/watcher.conf.j2

@@ -25,6 +25,7 @@ user_domain_id = {{ default_user_domain_id }}
 project_name = service
 username = {{ watcher_keystone_user }}
 password = {{ watcher_keystone_password }}
+service_token_roles_required = True
 
 memcache_security_strategy = ENCRYPT
 memcache_secret_key = {{ memcache_secret_key }}