trash-bin propfind responses are wrong in reva master

[phil-davis]

trash-bin propfind responses were fixed in edge PR #2821 and the core API test code was sorted out to correctly expect and process the responses, and to fail if it detects any problem.

As a result, the core API test code now fails the related tests when run against reva master branch. I will post a list of failing scenarios when I have a final test run.

The fixes from edge PR #2821 need to be back-ported to reva master, and then the test scenarios should pass again. Sadly, the backport is not just a simple cherry-pick - there are conflicts and significant code differences.