Cleanup in preparation for package review.

I'm taking on #235.  This is all stuff that came up while doing a
cursory package review myself.

- The source files all state that they are MIT, but the specfile and
  repo claimed to be GPL.  I switched everything to MIT (even though I
  favor GPL.. the source was MIT first before it was incorrectly
  labelled GPL).
- There are various bugs and lint issues in the specfile fixed here.
- Notably, the systemd service file is missing from the 1.0.0 tarball on
  PyPI, so I'll need to do a new release after this.

fedmsg.d/mbs-logging.py

@@ -1,7 +1,3 @@
-# Setup fedmsg logging.
-# See the following for constraints on this format https://bit.ly/Xn1WDn
-bare_format = "[%(asctime)s][%(name)10s %(levelname)7s] %(message)s"
-
 config = dict(
     logging=dict(
         loggers=dict(