logger initialization for environment added.
logger initialization for environment added.

Summary: there was no logger for the external learner, added

Reviewed By: germank

Differential Revision: D3620897

fbshipit-source-id: 96f2aa9b8388a45754bf7fa6013458d3f47b7ad5

Intelligent-Machine-Learning/Round1,general-ai-challenge/Round1,general-ai-challenge/Round1,Intelligent-Machine-Learning/Round1,Intelligent-Machine-Learning/Round1,general-ai-challenge/Round1