Dial down logging of which logging file is used

If properly configured this spams the logging output. Otherwise it's
pretty much guaruateed not to go anywhere useful. As a result it may
as well be level DEBUG anyway.

Change-Id: Ic62f2d79b8ccad2b4ce81a8853c9bcea2f333bb2
Fix #2785: Also log the level

syslog includes the time for us, so we don't need that. I also looked
at using %(processname)s, but that appears to return "MainProcess"
for all the places we log stuff from and thus isn't useful.

Change-Id: I6b02ee34c72a6c9fa9ab3c315754245cbe631087