vm/network: use metric to allow multiple routes to same VM
vm/network: use metric to allow multiple routes to same VM

This is required when VM has multiple interfaces (eg HVM: PV and stubdom).
Prefer the later one.

marmarek/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin