webadmin: Merge VM Reason column with status column

Merge the VM shutdown/Poweroff reason column with the
status column. The reason is shown as a note besides the
VM status.

Change-Id: I6b4967f8d3b626094e114b99c0823ecb17a7575f
Bug-Url: https://bugzilla.redhat.com/1065753
Signed-off-by: Ravi Nori <rnori@redhat.com>