Config subsystem module silently fails to load on absent config file

If you fail to specify a mandatory config file and/or have typo in the filename of a config file in a features.xml file, no error will be thrown at compile time, test time or run time, but the config subsystem module (and thus feature/bundle) will never load.

https://lists.opendaylight.org/pipermail/controller-dev/2016-March/011688.html