network: always call address ready callback if address is ready

network: always call address ready callback if address is ready

The address ready callback is used for cleaning up old addresses or
routes acquired by e.g. DHCP. However, the callback was called only
when the address was previously not ready. So, maybe, unnecessary
addresses or routes may not be cleared.

Also, this makes the callback is called slightly earlier. As it may
remove several addresses or routes, and possibly changes the link state.