[ACS4.4] Cherry-pick request : b4457d92f4ceec83f09b4514a0164c7ec3775e4d

[Yoshikazu Nojima]

Daan,
Could you cherry-pick the commit b4457d92f4ceec83f09b4514a0164c7ec3775e4d ?
It fix the bug that makes systemvm template build failed since newer
vboxmanage generates $appliance-$branch-vmware-disk3.vmdk.

Regards,
Noji