Support overriding Zookeeper connector to production via env property

This will allow to run production connector (and no stub runner) without `prod` profile (e.g. under `dev`) if `microservice.production` is defined
Isn't `ProductionZookeeperCondition` a negation of `TestingZookeeperCondition`? Thus, can't you implement the latter by simply negating the former? I.e. `!ProductionZookeeperCondition.matches(...)`?