Meta server: fix client authentication user and group update with no client threads, i.e. when all client protocol state machines are running in the main thread, by propagating user and group updates to the main thread client authentication context.
Meta server: fix client authentication user and group update with no client threads, i.e. when all client protocol state machines are running in the main thread, by propagating user and group updates to the main thread client authentication context.

quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs