BUG-614: migrate RuntimeGeneratedInvoker

RuntimeGeneratedInvoker is another DTO, so let's migrate it to
java-land.

Change-Id: If8e654c38de1be5f8e263f81eb7550d745913906
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-614: migrate RuntimeGeneratedInvoker"