rds pbrpc: use status from rpc message for callback
Merge remote-tracking branch 'MartinHaimberger/Devel'
icps: added EndSession call
mod/x11: detect logoff/shutdown from wm

The current solution is rather unix centric since
WaitForMultipleObjects doesn't not work with process HANDLEs yet.
rds: added logoffusersession call
sm: stop session if shutdown was acked
wrong logger in TaskModuleShutdown fixed
added the EndSession icps call and corresponding task