Remove addresses and ports from dir_server_t and just use the ones in fake_status

We put copies of an AuthDir / FallbackDir's addresses and ports in dir_server_t, and dir_server_t.fake_status. This is just asking for mistakes initialising them.

We could refactor the code so that we always use the addresses and ports in fake_status.

This is not particularly urgent, because dir_server_t is read-only.