Allow gluster to be used with linux automounter

Added (ignored) -n option to mount.glusterfs command

Change-Id: I9209da215d38507cd9d01b1e9af4aecff4414f83
BUG: 1123004
Signed-off-by: Anders Blomdell <anders.blomdell@control.lth.se>
Reviewed-on: http://review.gluster.org/8373
Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>