Errors in the config file will be hidden from the user

[tobyweston]

The general behavior is to attempt to load the config file and if that fails, bootstrap a new conifg based on environment variables.

If the radiate.cfg for some reason fails (knobs fails to load), the error will be hidden and the bootstrap process will incorrectly kick off. The result is potentially misleading error message (for example, it might say the TEAMCITY_URL is missing rather than report that the file was bad).

See KnobsConfig.scala ~L21

It's the load orElse create behaviour that's to blame.