Merge branch 'master' into tucker/feature-gpu-images #9400

Job	Run time
examples-rl (e10_drive)	5m 25s
base-tests (./cli)	2m 52s
examples-rl (e11_platoon)	3m 11s
benchmark (e10_drive)	3m 24s
base-tests (./envision)	3m 12s
benchmark (e11_platoon)	2m 10s
base-tests (./smarts/core --nb-exec-timeout 65536 --ignore=./smarts/core/tests/test_notebook.py)	19m 34s
base-tests (./smarts/env --ignore=./smarts/env/tests/test_rllib_hiway_env.py)	4m 30s
base-tests (./smarts/env/tests/test_rllib_hiway_env.py)	3m 16s
base-tests (./smarts/sstudio)	2m 51s
base-tests (./smarts/ray)	3m 5s
base-tests (./examples/tests/test_examples.py)	4m 50s
	58m 20s

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