kiji-mapreduce: KIJIMR-304. Cassandra tests in KijiMR should not use CMP

issue: https://jira.kiji.org/browse/KIJIMR-304

Just removed the integration tests for now because they will not work without
some kind of external Cassandra process.  Will enable them again with Bento
plugin.

review: https://review.kiji.org/r/2143
commit: https://github.com/kijiproject/kiji-mapreduce/commit/28f683e0d6f3f1761f6b3752709117634865ac6a