glusterd: Fix check for task-id existence in 'volume status'

This fixes the issue of task-id tests failing randomly. The condition used to
check rebalance/remove-brick was running was wrong, which could lead to the
task-id for these tasks to not be displayed even when the actual commit hadn't
occured.

Change-Id: I765daceda5b6bed1387342c15f9ea00552ac85f5
BUG: 857330
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/4514
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>