Ignore the generated_classes created by the JUnit tests
Ignore the generated_classes created by the JUnit tests

These are written out when debugging tests from within Eclipse.

Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

GerritCodeReview/gwtorm,thinkernel/gwtorm,thinkernel/gwtorm,1yvT0s/gerrit.gwtorm,evanchueng/gerrit.gwtorm,GerritCodeReview/gwtorm,CandyShop/gerrit.gwtorm