Branch b1_4

Branch b1_4
Description: When migrating a subset of services from a node (e.g. failback
	     from a failover service node) the remaining services would
	     time out and evict clients.
Details    : lconf --force (implied by --failover) sets the global obd_timeout
	     to 5 seconds in order to quickly disconnect, but this caused
	     other RPCs to time out too quickly.  Do not change the global
	     obd_timeout for force cleanup, only set it for DISCONNECT RPCs.
b=6395, b=9514