BUG-614: migrate RuntimeGeneratedInvokerPrototype

Splits off RuntimeGeneratedInvokerPrototype DTO into java. There is no
reason it should be in xtend.

Change-Id: I625d44d398cfe72be21ac33d29986c736412970e
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-614: migrate RuntimeGeneratedInvokerPrototype"