SDC-1717. Add placeholders for new stages in the helpref.properties
SDC-1717. Add placeholders for new stages in the helpref.properties

Change-Id: I3f34953bc51cad287d24ad51baf9ba2f7fed555a
Reviewed-on: https://review.streamsets.net/1246
Reviewed-by: Brock Noland <a34d47d11bef4e101aa6199cf903b81b91e09c75@streamsets.com>

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