glusterd: Making volume-reset use synctask framework

Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Change-Id: Ib25c8fa69d84b8132505ae3f1e67cf88d3f6f9ec
BUG: 852147
Reviewed-on: http://review.gluster.org/4474
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>