glusterd: log changes in volume set and volume reset codepath

Change-Id: Ieed9194768e434e54ea7d3d42b705eb600445cf4
BUG: 812356
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: http://review.gluster.org/4543
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>