mgmt/glusterd: Validate the options of uss

Change-Id: Id13dc4cd3f5246446a9dfeabc9caa52f91477524
BUG: 1111554
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/8133
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>