vlan interfaces do not allow the parent interface and the vlan number to be

reconfigured after they are set. so they bail out when you try to. so when
you re-run netstart on a machine with vlans, it bails out with
ifconfig: SIOCSETVLAN: Device busy
and IP changes are not done.
make vlan_config() notice when both parent interface and vlan number stay
the same and just return success without doing anything in that case.
allows the IP config thereafter to happen. ok markus jason

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