[MERGE] Add --protocol option to 'bzr serve'.

[Jelmer Vernooij]

This patch adds a --protocol option to bzr serve that is extendable
through a registry. This makes it possible for plugins to register new
protocols that can be served. Loggerhead would be a candidate for this 
(currently it wraps cmd_serve), and bzr-svn and bzr-git need to do this as
well. 

Having the registry live in cmd_serve.protocol_registry is a bit
unusual I guess, but it seemed like the cleanest way to do this
without polluting the top-level namespace of bzrlib.builtins.

Cheers,

Jelmer
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