cli,glusterd: Fix when tasks are shown in 'volume status'

Asynchronous tasks are shown in 'volume status' only for a normal volume
status request for either all volumes or a single volume.

Change-Id: I9d47101511776a179d213598782ca0bbdf32b8c2
BUG: 888752
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/5308
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>