* Convert multi_node_test.py to pytest.
* Convert array_test.py to pytest.
* Convert failure_test.py to pytest.
* Convert microbenchmarks to pytest.
* Convert component_failures_test.py to pytest and some minor quotes changes.
* Convert tensorflow_test.py to pytest.
* Convert actor_test.py to pytest.
* Fix.
* Fix
* build_credis.sh: use an up-to-date credis commit.
* build_credis.sh: leveldb is updated, so update build cmds for it
* WIP: make monitor.py issue flush; switch gcs client to use credis
* Experimental: enable automatic GCS flushing with configurable policy.
* Fix linux compilation error
* Fix leveldb build
* Use optimized build for credis
* Address comments
* Attempt to fix tests
