SW-818: fixed t_trigger_service.py and made sure that Popen is mocked away so the test does not make acual calls to the tbbctl.

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

SW-560: do freeze right away in the voevent handler. issue dump via slow(ish) rpc call to tbbservice

SW-567: added and used TaskInfoCache for fast lookup of info needed to accept/reject tbb alert voevents. The TaskInfoCache preloads all current information upon start, and then resfreshes itself on task status events, so it's always up to date.

Task SW-560: Added executables to operate tbb via tbbservice, refined recipe according to discussion with Sander

Task SW-539: implement decider for Alert that rejects test events and events happening in the past or more than half an hour from now

Task SW-539: correctly parse timestamp from VO event and determine the frequency-corrected start/stop times for the TBB freeze.

Task SW-559: provide interfaces for decider and event listener implementations, general layout of the decision-making and integration in the triggerservice.