Decongestion potential bottlenecks on trivial_rewrite(8).

Which might be caused by slow LDAP lookups in transport_maps.  Instead,
we alias each addresses for which we want a custom transport to a
dedicated "dummy" domain, and use a static (CDB) transport_maps to map
said domains to their transport;  the receiver can then use canonical(8)
to restore the original envelope recipient.  Since the alias resolution
is performed by cleanup(8), which can run in parallel with other
instances, it should decongestion bottlenecks under heavy loads.

So far only the MX:es have been decongestioned.  The list manager and
the MDA should be treated as well.

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