Fix the catch-all resolution again.

We introduce a limitation on the domain-aliases: they can't have
children (e.g., lists or users) any longer.

The whole alias resolution, including catch-alls and domain aliases, is
now done in 'virtual_alias_maps'. We stop the resolution by returning a
dummy alias A -> A for mailboxes, before trying the catch-all maps.

We're still using transport_maps for lists. If it turns out to be a
bottleneck due to the high-latency coming from LDAP maps, (and the fact
that there is a single qmgr(8) daemon), we could rewrite lists to a
dummy subdomain and use a static transport_maps instead:

  virtual_alias_maps:
    mylist@example.org -> mylist#example.org@mlmmj.localhost.localdomain

  transport_maps:
    mlmmj.localhost.localdomain mlmmj:

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