glusterd/snapshot: Inherit the mount options of a original brick when creating snapshots.

When creating a snapshot a LVM is created at the backend and is mounted
under /var/run/gluster/snaps/... However, this mount does not inherit
the mount options for the original brick acting as the parent for the
snap.

If the snap is restored, this could lead to performance degredations,
functional limitations, or in extreme scenarios even potential data
loss.

Change-Id: I67d70fd83430d83dacc5380c6c928e27fb9c9e1b
BUG: 1145088
Signed-off-by: Vijaikumar M <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/8394
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>
Signed-off-by: Sachin Pandit <spandit@redhat.com>
Reviewed-on: http://review.gluster.org/8802
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>