This patch fixes a mismatch between the way network interfaces are
looked for from network cards, and the way they are created:
- If a network card has a NAC address, it used in the search criteria to
find the network interface
- When creating virtual interfaces, the MAC address is not specified in
the creation parameters
This raises an exception when a virtual card has a MAC address:
- The virtual interface has been created without MAC address
- But the network card has one, so the interface is looked for using it
- The network interface is not found, so it's created
- An error is risen because an interface with the same name already
exists
This patch sets the MAC address on the interface if it exists, no matter if
it is virtual or not.
