[2.2] Allow pod syncing to fail for pre-existing or manual composed machines bad physical storage.

[Blake Rouse]

In some cases Pod drivers will not return all the required information for a physical block device. Instead of failing when the syncing machine is a pre-existing or manually composed it should allow this to fail, since the machine will be commissioned anyway. For dynamic composition it is not possible for it not to provide the required information as commissioning will not be performed.