Fix test.sh not to check CLUSTER_ID when deleting a cluster (#347)
Fix test.sh not to check CLUSTER_ID when deleting a cluster (#347)

Instead of checking CLUSTER_ID before deleting a cluster, which may interfere with CI jobs that set that env variable, define a separate variable to keep track of whether a cluster was created or not.
mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service