Set VM back to its original state if cold migration failed

If migration of a VM in the SHUTOFF state failed due to
NoValidHost, the VM was erroneously set to ACTIVE.

The fix sets the VM back to its original state instead.

Fix bug 1204905

Change-Id: I06f6a2e8a05e715c505a24d3013f482eaea3df8b
Merge "Set VM back to its original state if cold migration failed"