Merge branch 'soccer-2v1' into asymm-envs

Project/Assets/ML-Agents/Examples/Soccer/Prefabs/SoccerFieldTwos.prefab

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Project/Assets/ML-Agents/Examples/Soccer/TFModels/SoccerTwos.nn.meta

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Project/Assets/ML-Agents/Examples/Tennis/Prefabs/TennisArea.prefab

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ml-agents/mlagents/trainers/ghost/controller.py

-import logging
+from mlagents_envs.logging_util import get_logger
-logger = logging.getLogger("mlagents.trainers")
+logger = get_logger(__name__)
 
 
 class GhostController(object):