SW-699: added UsingToBusMixin, and (re)use that in all the ServiceMessageHandlers and some AbstractMessageHandler derivatives

SW-699: added documentation to RPCClientContextManagerMixin. renamed rpc_service.py module tp rpc.py, and it's classes to RPCClient and RPCService. Moved Request and ReplyMessage into rpc.py module. Mader MessageFactory and used it in FromBus and rpc.py

SW-699: specify the kwargs not in the contructor, or else you might lose some of the kwargs which are already normal arguments like subject, priority etc

SW-699: refactored/simplified RPC as well. Refactored has_args/has_kwargs quirks in RequestMessage. Have one simple API.

SW-699: major refactoring of the messagebus's BusListener and Service. Together with Jan-David and Auke, I decided to only allow a single API for the service, and we chose the most commenly used API based on the MessageHandlerInterface which we refactored into the ServiceMessageHandler. TODO: add docstrings, fix tests, adapt all Services in lofar python code.

SW-699: fixed some typos. Made TemporaryQueue bindable to and exchange. Route RPC-ReplyMessages via exchange to temporary reply queue

SW-699: major rewrite of FromBus/ToBus, AbstractBusListener and RPC/Service based on kombu/rabbitmq. This allows us to use a single lofar exchange (multiple exchanges are still allowed), and using auto-generated designated queues with subject based routin_keys.

SW-699: Use a single broker and bus (exchange), and make service names unconfigurable (fixed in Service and RPC). Greatly reduces configuration size.

SW-657: added TODO to handle exception on sending to removed-temp-queue when an rpc client did timeout

SW-658: needed to refactor parts of the FromBus/ToBus because connections were not released. Took the opportunity to factor out common behaviour into abstract super class.

SW-516: remove 'options' from messagebus classes, as these were qpid options, and we're using proton now. At this moment there is no need for such options. These can be added later when needed.

Task SW-609: Replace qpidtoollibs in test_ra_service_and_rpc.py by a proton broker for testing; Fix use of provided broker url

Task SW-516: Switch from qpid.messaging library to Apache Qpid Proton so we can use the message bus with Python 3

Task #10057: made autocleanupservice which listen for ingested tasks, and then issues a data cleanup action for that task

Task #8758: merge from branch RA-Task8758 to trunk. svn merge did not work, so I used svn diff on branch and svn patch to trunk. For revision history, see branch.

Task #8888: Fix queue options in FromBus and ToBus, and force the use of topics when providing Services (to prevent bugs)