Add test for isPubkeyBlacklisted

This adds a negative and positive test for pubkey blacklisting.

(cherry picked from commit 0dc81a43663d3e66da8750b69ff2aa78eec461f9)

Bug: http://code.google.com/p/android/issues/detail?id=35547
Change-Id: Ib73f6ec7b3b965a5984f95930d49251559debb0c
1 file changed