* Use lmove() when working on a single queue
* Skip reliable queue tests if Redis server doesn't support LMOVE
* Better test coverage
* job.origin should be string
* Added test for job that gets orphaned if worker.execute_job() fails
* Fix job tests
* worker.run_maintenance_tasks() now cleans intermediate queues
* Fixed import ordering
* No need to run slow tests and flake8 on SSL tests
* Minor typing fixes
* Fixed linting
Selwin Ong