Reduce spew of some daemons

Summary:
It used to be more useful for daemons to spew random debugging information, but
features like "phd debug" and some fixes to error reporting like D1101 provide
better ways to debug, test, develop and diagnose daemons.

• Stop writing "." every time MetaMTA sends a message.
• Stop spewing the entire IRC protocol from the IRC bot unless in debug mode.
• Stop writing GC daemon log entries about collecting daemon logs (DURRR)

unless in debug mode.

Test Plan: Ran daemons in debug and non-debug modes, got expected level of
noisiness.

Reviewers: jungejason, nh, btrahan

Reviewed By: jungejason

CC: aran, jungejason

Differential Revision: https://secure.phabricator.com/D1268