Increase salt logging

Salt logs at 'warning' level by default. Dan recently set this to 'info'
on one of our projects and it has helped me immensely. With 'info'
logging, you will see the diff of config files that have changed, and
you often get the actual linux command that failed (which sometimes you
don't get at warning level).

This is really verbose though. I like it, but I can see how people might
rather it be set at warning by default, and then manually set it to INFO
when an error occurs. Unfortunately, if the error is not repeatable,
then this wouldn't help.
Merge pull request #119 from caktus/feature/increase-salt-logging

Increase salt logging