Do address assignment/removal operations after callbacks.

Presently, ifconfig callbacks are used for L2 configuration, media
and vlan, so actions associated with address assignment, like sending
out a gratuitous ARP, should go when L2 is running already.

This also should fix the problem with setting up vlan interfaces
from rc.conf, when both IP and vlan+vlandev parameters are passed
to ifconfig at once.

Future work: Consider introducing several ifconfig callback lists
to invoke callbacks orderly.

MFC after:	1 week

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