LU-5289 mdc: cleanup intent if mdc_finish_enqueue() fails

LU-5289 mdc: cleanup intent if mdc_finish_enqueue() fails

In mdc_enqueue() clear the lock handle, lock mode, and request stored
in the lookup intent if mdc_finish_enqueue() fails.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I233588ab13df86be509a9763e00697d29dee1c7c
Reviewed-on: http://review.whamcloud.com/10963
Tested-by: Jenkins
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>