Description

For each zmq topic we should have a regression test that ascertains it continues to work

Motivation

So we don't accidentally remove zmq topics

Issues / Scenarios

See each topic in https://github.com/iotaledger/iri/blob/dev/src/main/java/com/iota/iri/zmq/README.md

How to test for this

We can hook into already existing tests and just add the necessary steps.
Since spinning up a cluster takes time, we don't want to make the regression tests take much longer time.