Fix RBFeatureChecker tests
Fix RBFeatureChecker tests

The RBFeatureChecker was renamed from LocalSiteFeatureChecker during
review. This patch corrects the tests to reference the correct class.

Testing Done:
With this patch applied, the feature checker tests run and pass.

Reviewed at https://reviews.reviewboard.org/r/8527/

chipx86/reviewboard,brennie/reviewboard,sgallagher/reviewboard,davidt/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,davidt/reviewboard,davidt/reviewboard,chipx86/reviewboard,sgallagher/reviewboard,brennie/reviewboard,reviewboard/reviewboard,brennie/reviewboard,brennie/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,davidt/reviewboard,sgallagher/reviewboard