Updated to cassandraunit 1.1.2.1 and therefore Cassandra 1.2.0.

Fixed integration tests to work with the new Cassandra version.

Disabled WhenManagedCassandraLifecycleIsManaged tests as the mocking fails.

Integration tests are run in forked mode to create a separate JVM for each test.

Change-Id: I527425165e44148461d5219d7d861fa713dfff4d