Merge remote-tracking branch 'upstream/master' into feature.shutdown-gracefuly
Added tests
Renamed on_waitress_channel_close() to on_channel_close()
Some channel were not closing even if they didn't have any request left
Graceful shutdown shuts down pending keep-alive connections
Renamed method
Added debug log on sigusr1
fix
Merge branch 'feature.shutdown-gracefuly'

Conflicts:
	waitress/server.py