dht: handle ESTALE/ENOENT in dht_access

Had misssed out dht_access in the previous round of cleanup

Change-Id: Ib255b9ad13ca62a8bc2eea225c46632aff8e820f
BUG: 1032894
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/6496
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@gmail.com>