vmm/virtualbox: Update unique identifiers after a parcel is cloned
vmm/virtualbox: Update unique identifiers after a parcel is cloned

- When starting run mode, check that the VM UUID matches the parcel UUID.
If not, update the VM name and UUID, the VM's MAC addresses, the path to
the Nexus device, and the VMDK UUIDs.

- Move parcel name generation to a helper function

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr