failures of bugzilla tests
Merge pull request #371 from skallesh/skallesh

failures of bugzilla tests
added reference comments
implemented BrandbotShouldHandleNonExistantBrandingFile_Test
implemented BrandbotShouldHandleEmptyBrandingFile_Test
changed getEligibleBrandNamesFromCurrentEntitlements() to return a Set
instead of a List
assert updates after bug fix 1034396 - repo-override command should
not require entitlements
more assertion updates after bug fix 1034396 - repo-override command
should not require entitlements
added more FlexibleBrandingTests