LU-4423 lnet: remove LNET_MUTEX_LOCK macro

LU-4423 lnet: remove LNET_MUTEX_LOCK macro

LNET_MUTEX_LOCK and LNET_MUTEX_UNLOCK are verbose wrappers to mutex_lock and
mutex_unlock.  Get rid of these.

Change-Id: Icdb029441d57ce080ce4b1e7990d38d4ff0edf26
Signed-off-by: Mike Shuey <shuey@purdue.edu>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: http://review.whamcloud.com/18985
Tested-by: Jenkins
Reviewed-by: Frank Zago <fzago@cray.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>