CLOUDSTACK-5485: Use edge-triggering in MessageDetector to handle bogus wakeup gracefully. Level triggering plus bogus wakeup can cause a tight loop to spin
CLOUDSTACK-6742: listVolumes - As regularuser , able to list Vms and
volumes of other users.
bugfix: systemvm template build failed

since newer vboxmanage generates $appliance-$branch-vmware-disk3.vmdk