glusterd/snapshot: Don't append nouuid mount option for snapshot brick
if original brick already has this option

Change-Id: I2841d2ac371a3e9505f6061f35d1d447946c0bae
BUG: 1133456
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/8526
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>