add role and group so agent can update the status

From  the bug below. It seem it is not allowed that agent change request status in reqmgr.

2014-06-09 19:30:26,851:WARNING:Service:The cachefile /data/srv/wmagent/v0.9.91/install/wmagent/TaskArchiver/.wmcore_cache/.wmcore_cache_31961/requests/cmsweb.cern.ch/7106221298909341352_PUT_request does not exist and the service at https://cmsweb.cern.ch/reqmgr/rest/request is unavailable - it returned 403 because Forbidden
 with result: {"exception": 403, "message": "Failed to change status: Cannot change status from normal-archived to normal-archived.  Allowed values are []", "type": “HTTPError"