features/gfid-access: Handle inode remap when parent inode is NULL

Change-Id: Ic3f9d30d75df0bbbdf8fe28446fabe62d90fa854
BUG: 1024666
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/6194
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>