netlogger probe - change to probe api, probes can now return a list of dicts, and can set their own ts
Load of changes... I got carried away.

Fixed an issue where new probes were being started every time reload_all was called. This was due to adding measurement to the config in the collector.

Removed some spurious junk from the service config that should never have been there.

Some work on netlogger_probe that I probably should have committed before.

Extra logging in probe_arbiter.