* Use pep8 style
The original style file is actually just pep8 style, but with everything
spelled out. It's easier to use the `based_on_style` feature. Any overrides are
clearer that way.
* Improve yapf script
1. Do formatting in parallel
2. Lint RLlib
3. Use .style.yapf file
* Pull out expressions into variables
* Don't format rllib
* Don't allow splits in dicts
* Apply yapf
* Disallow single line if-statements
* Use arithmetic comparison
* Simplify checking for changed files
* Pull out expr into var
* WIP: removing OL, OI, TT on client exit; no saving yet.
* ray_redis_module.cc: update header comment.
* Cleanup: just the removal.
* Reformat via yapf: use pep8 style instead of google.
* Checkpoint addressing comments (partially)
* Add 'b' marker before strings (py3 compat)
* Add MonitorTest.
* Use `isort` to sort imports.
* Remove some loggings
* Fix flake8 noqa marker runtest.py
* Try to separate tests out to monitor_test.py
* Rework cleanup algorithm: correct logic
* Extend tests to cover multi-shard cases
* Add some small comments and formatting changes.
