Rely on upstream ajsonrpc quart integration

The former integration has been submitted as a Pull Request to upstream and was accepted there. This Merge Request wipes out the custom integration and relies on the new release with the submitted changes to the upstream ajsonrpc.

\approve @prehn

obmdataapi/__init__.py

@@ -20,7 +20,7 @@ import logging
 import sys
 
 from quart import Quart
-from .jsonrpcquart import JSONRPCQuart
+from ajsonrpc.backend.quart import JSONRPCQuart
 
 logger = logging.getLogger()
 logger.setLevel(logging.DEBUG)