rq child process logging broke burst click logs and unit test cli ckan jobs worker --burst logging

ckan (master) has moved from
rq==1.16.2
to
rq==2.3.3

There has been subtle changes under the hood where the worker thread is now spawned as a child and may not synchronise log back to click cli routing. This causes many tests looking for ``assert "Express Load completed" in stdout`` to fail even though the job passed on what occurred on inside ckan processing.

Start by reproducing the ckan jobs worker --burst logging failure and inspect the unit tests that assert "Express Load completed" in stdout. Trace how the child worker process routes logs to the Click CLI; done means the job still succeeds and the affected stdout assertions pass.

Written by the indexing model from the issue text.