glusterd: Added missing MY_UUID conversion in gsync staging

Change-Id: Ia4bf607e044d50636fb0a599a2ff91059f5b17aa
BUG: 1006177
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/5887
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>