[CI] Ensure prepare-cluster.sh will fail when deployments fail. #1604

Job	Run time
database-tests (ORACLE)	4m 52s
scan	4m 28s
database-tests (DB2)	7m 24s
build	28m 9s
Build and Publish Images / Prepare Job	8s
Build and Publish Images / Build extra images	27s
Build and Publish Images / Publish (spring-cloud-dataflow-composed-task-runner, spring-cloud-dataflow-composed-task-runner/t...	2m 48s
Build and Publish Images / Publish (spring-cloud-dataflow-server, spring-cloud-dataflow-server/target, springcloud/spring-cl...	2m 59s
Build and Publish Images / Publish (spring-cloud-dataflow-single-step-batch-job, spring-cloud-dataflow-single-step-batch-job...	2m 47s
Build and Publish Images / Publish (spring-cloud-dataflow-tasklauncher-sink-kafka, spring-cloud-dataflow-tasklauncher/spring...	2m 7s
Build and Publish Images / Publish (spring-cloud-dataflow-tasklauncher-sink-rabbit, spring-cloud-dataflow-tasklauncher/sprin...	2m 22s
Build and Publish Images / Publish (spring-cloud-skipper-server, spring-cloud-skipper/spring-cloud-skipper-server/target, sp...	2m 11s
done	1s
	1h 0m 43s

Provide feedback