Code review comment for lp://staging/~awn-core/libdesktop-agnostic/various-fixes

I don't agree with the changes made to test-config.vala. If anything, there should be a --verbose flag that allows messages to be optionally printed. I would prefer if test programs emitted as little non-error text as possible by default, so that they can be integrated into a `./waf test` or whatever it will be called.