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: added has_args/has_kwargs parameters as header items, so we can pass along the args and kwargs from RPC to Service

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

Task #9931 #10057: merged feature branch ^/branches/ltaingest-Task9931 into LOFAR-Release-2_19 branch

Task #8531: start and stop listening can now be used without -with- which defaults to start listening now. refactored some code and added support in RPC for multiple arguments.

Task #8531: Remove support for Binary message content and ensure Strings are always unicode when sent. Also make sure 'content' is first positional argument for EventMessage due to the way the message factory works. This breaks TreeStatusEvents.py which should use named arguments instead.

Task #8571: Replaced very modern python expression by more obsolete set expression so that primitive machines can handle this

Task #8571: Replaced very modern python expression by more obsolete set expression so that primitive machines can handle this