Drop fedmsg for fedora-messaging
This commits drops support for fedmsg in favor of fedora-messaging.
It adds a couple of example configuration file for fedora-messaging, one
allowing to listen to fedora's public bus allowing to tests resultsdb-
listener with real data and one closer to what a production configuration
file would look like.
Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>