NIFI-5209 Removed secure hash functionality from ConfigEncryptionTool.

[alopresto]

This feature was added to support external integration with Apache Ambari. Ambari developers then discovered a problem with the joint proposal and we built a different way to accomplish the goal. This behavior should be removed so it does not go in a release and need to be supported unnecessarily.

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[thenatog]

Reviewing..

[thenatog]

Looks fine to me after looking at https://issues.apache.org/jira/browse/NIFI-4942, executed encrypting a properties file which worked and attempted to use the -z param which no longer works. Had a look through the code changes/remaining code and didn't see anything related to the hashing being left behind.

[kevdoran]

+1

looks good. merging to master...