unfortunately the API changes introduced in change
I277aa90fddb5171c4bf6c3436259aa371d30d092
broke the API interface of http_json_api.py. This was taken into account and necessary to introduce add the server functionality next to the already existing client functionality. The changes to the API were minimal and all code locations that use http_json_api.py were re-aligned.
Unfortunately it was not clear at this point in time that there are out-of-tree projects that could be affected by API changes in http_json_api.py
To mitigate the problem this patch introduces an alternative API interface to the JsonHttpApiFunction base class. This alternative API interface works like the old API interface when the class is instantiated in the original way. To make use of the revised client the API use has to pass an additional keyword argument that defines the role.
