Branch b_release_1_6_5

Branch b_release_1_6_5
b=15759
Description: MDS or OSS service threads fail startup with -24 (-EMFILE)
Details	   : During startup under recovery, it is possible for service
	     thread startup to fail in ptlrpc_start_threads() if one
	     of the threads begins processing a request and then starts
	     an additional thread.  This causes ptlrpc_start_threads()
	     to try and start 1 too many threads and get an error.
i=robert.read
i=oleg.drokin