This now shares the _compose() decorator with wormhole.cli.cli, and removes
the arguments_to_config() function in favor of just copying all kwargs into
the Config object.
We already hard-code 'relay.sqlite', so I don't see a lot of value in
making making the stats file configurable too. That said, if it makes
life easier for packagers (e.g. start-stop-daemon or systemd wanting
these files to go into /var/run/something/ , and if it isn't sufficient
to just use /var/run/something/ as the CWD), I'd accept a patch to
add it back.
There was some vestigal server-cli code (leftover in the client-side
wormhole.cli.cli_args) that used port 3000/3001, and it accidentally got
used for the new Click-based parser, rather than the actual server-cli
code (in wormhole.server.cli_args) that uses port 4000/4001. This
changes the port numbers to match (everything uses 4000/4001 these days,
to avoid confusing interactions with the old 0.7.6 server that might
still be listening on the old ports).
