LU-4179 mdt: skip open lock enqueue during resent

Skip open lock enqueue, if the open lock has been
acquired(mdt_intent_fixup_resent) during resent.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I625ca438e28520416ee2af884d0a9f9e6f21cf2e
Revert "LU-3544 nfs: writing to new files will return ENOENT"

This commit created a problem lu3765 - crash of 2.1 servers when
exposed to clients with this patch and we don't have a robust
solution in sight for it, so reverting

This reverts commit 77a3c625c733edfaa748d2c7130d5635ee63ce15.