1024 - Add XucUse dependency to LoginController to force load of XucAgent service

XucAgent requires the list of User statuses to display correctly custom status. Problem is this service may be loaded too late. The User Statuses message is sent by Xuc upon connection establishment, so if the XucAgent is not loaded soon enough, the message is not received by it. Adding this dependency force the load of this service before establishing the connection so we are sure the service will receive the required message

⚠ This MR should be merged in 2017.03 and master branches

Closes #1024 - CCManager does not display custom agent status