Create a travis build that runs Druid on a K8S Cluster and runs the integration tests

Currently we have many different travis builds that setup a single node druid cluster and run integration tests.

This issue is to have one more that sets up the Druid cluster inside a K8S cluster (maybe using https://github.com/druid-io/druid-operator ) and runs some of the integration tests.

Once above setup exists, as a follow up, it would be modified to run Druid without Zookeeper for continuous integration testing of ability to run Druid without Zookeeper(see #9053 ) inside K8S Cluster.

Start by reviewing the existing Travis builds that create single-node Druid clusters and run integration tests. Evaluate whether the Druid operator can create the cluster in Kubernetes, then define which integration tests should run there. Done means a Travis build provisions Druid in a Kubernetes cluster and executes the selected tests; the follow-up should address the no-ZooKeeper case described in #9053.

Written by the indexing model from the issue text.