Pulp

I had a user #pulp report that he had to clean out /var/lib/pulp/working/repos directory to clean up disk space.

I suspect this occurs in some cases when we don't handle properly a failure of a sync or publish. I have not dove into the code to determine the actual problem. However, this is now fixed on master with the new working directories implementation. The cleanup now occurs on a task success or failure. The working directories are also cleaned up on worker restart.

We should add some documentation that acknowledges that this is a known problem.