RSN-OMS – CI interface clean-up and adjustment in JSON payload for event notification

Reflects most of long-standing deprecations and recent simplification of the CI-OMS interface specification. I went ahead with a big part of the corresponding clean-up in the code to help facilitate upcoming integration of  development by RSN folks (not to mention our own coding and testing).

The changes here have been very systematic; all unit tests and some of the key integration tests are passing as usual (and taking several minutes less!).  We can have a more complete validation with the help of buildbot.

I love cleaning up.

@edwardhunter please merge