fixes the craziness in JavaUniverse.log

This long-standing, but trivial to fix nuisance in the implementation of
runtime reflection actively avoided being fixed in both 2.10.0 and 2.10.1.

It's finally the time to put it to a rest.
Merge pull request #2283 from scalamacros/topic/silence-the-log

fixes the craziness in JavaUniverse.log