Remove Deprecated Shutdown strategy classes #1696

Job	Run time
database-tests (ORACLE)	4m 13s
scan	4m 12s
database-tests (DB2)	6m 54s
build	35m 4s
Build and Publish Images / Build extra images	43s
Build and Publish Images / Prepare Job	10s
Build and Publish Images / Publish (spring-cloud-dataflow-composed-task-runner, spring-cloud-dataflow-composed-task-runner/t...	1m 6s
Build and Publish Images / Publish (spring-cloud-dataflow-server, spring-cloud-dataflow-server/target, springcloud/spring-cl...	1m 45s
Build and Publish Images / Publish (spring-cloud-dataflow-single-step-batch-job, spring-cloud-dataflow-single-step-batch-job...	1m 1s
Build and Publish Images / Publish (spring-cloud-dataflow-tasklauncher-sink-rabbit, spring-cloud-dataflow-tasklauncher/sprin...	1m 41s
Build and Publish Images / Publish (spring-cloud-dataflow-tasklauncher-sink-kafka, spring-cloud-dataflow-tasklauncher/spring...	1m 42s
Build and Publish Images / Publish (spring-cloud-skipper-server, spring-cloud-skipper/spring-cloud-skipper-server/target, sp...	1m 44s
done	1s
	1h 0m 16s

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