LU-2827 ldlm: wrong handling of ldlm resends

LU-2827 ldlm: wrong handling of ldlm resends

If a successful reply is lost for an intent
lock request, MDS will not correctly recover
from this situation on resend. Instead, a new
lock is created.

Lustre-commit: I9a23c13313d5168d0c232fdc0acbdab330089356
Lustre-change: http://review.whamcloud.com/5978

This patch also adds handling of resend during layout-lock

Lustre-commit: Ideb551779a884d77ded8036c513f62557b2dfcde
Lustre-change: http://review.whamcloud.com/#/c/10378

Change-Id: I6745461b2a1370837be7bcbff12dc021cd1021cf
Signed-off-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>