Ensure we can write tests for generated client

[Miles-Garnsey]

We can't currently write integration tests for the generated client because the client is generated (but not compiled) at the point at which the integration tests are compiled.

Definition of done

• We can write an integration test which tests the generated client against a real Cassandra server.

[Miles-Garnsey]

Marking as urgent because we want to merge the integration branches, and we've decided we definitely need integration tests before doing so.

[adejanovski]

After discussing this with Erik, it seems like this is unlikely to happen.
I recommend to take this out of the pre-req for merging the integration branch and revisit how we can handle this because not having tests makes me as nervous as you.