1161205 - Adds comments to conf files about value of defaults

https://bugzilla.redhat.com/show_bug.cgi?id=1161205

I grepped across all plugins (including the new Python one) and searched for conf files that are user facing. I updated all of them and checked that the defaults are actually the defaults. For the small differences I found I filed separate bugs, but those are separate issues.
s/will choose not/will choose if not/