Code review comment for lp:~bcsaller/pyjuju/sane_output_test_option

I've been thinking about this, and this is a backward incompatible change, I'm afraid.

Up until now, charms w/ boolean configs have been able to count on "True" or "False" and have been written as such.

This will change the case, and that is, unfortunately, not acceptable in the planned "fixes only" release of Juju.

The --test is fantastic, and should be added. But I'm afraid if we do the other bit without bumping to a new "major release" we will have many many broken charms very suddenly.