Add tests for asynchronous calls of "execute_workflow_activity" (API2)
Add tests for asynchronous calls of "execute_workflow_activity" (API2)

stefanomarty/openxpki,oliwel/openxpki,stefanomarty/openxpki,oliwel/openxpki,stefanomarty/openxpki,openxpki/openxpki,oliwel/openxpki,oliwel/openxpki,openxpki/openxpki,oliwel/openxpki,openxpki/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,openxpki/openxpki,stefanomarty/openxpki,oliwel/openxpki