End-to-end test: Cassandra connector

In order to test the integration with Cassandra, we should add an end-to-end test which tests the Cassandra connector. In order to do this, we need to add a script/function which sets up a Cassandra cluster. Then we can run a simple job writing information to Cassandra using the CassandraRowWriteAheadSink and the CassandraTupleWriteAheadSink.