Test graveyard

[timfox]

I have created a directory messaging/graveyard into which we should put any test java files that are no longer valid (instead of deleting them).

If only some of the tests in an individual test file are invalid they can be cut and pasted into GraveyardTest.

These will then be automatically excluded from the test run.

[adrian.brock]

Your using a version control system, just delete me. They are trivial to get back.

While you are at it, remove all the "abandoned" directories since that is very
confusing when trying to understand how the codebase works.

[ovidiu.feodorov]

These tests are special because they refer to a subject in contention. I would like to have them around for a little bit, even if they are not run as part of the build.

Broken tests are just deleted, as you suggested.