Revert "storage/posix: Remove the interim fix that handles the gfid race"

This reverts commit 97807e75956a2d240282bc64fab1b71762de0546.

In a distribute or distribute-replica volume, this fix is required to prevent
gfid mis-match due to race issues.

test script bug-767585-gfid.t  needs a sleep of 2, cause after setting backend
gfid directly, we try to heal, and with this fix, we do not allow setxattr of
gfid within creation of 1 second if not created by itself

Change-Id: Ie3f4b385416889fd5de444638a64a7eaaf24cd60
BUG: 951195
Signed-off-by: shishir gowda <sgowda@redhat.com>
Reviewed-on: http://review.gluster.org/5240
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>