Simplify logging when logging level is INFO
Simplify logging when logging level is INFO

Summary:
Buck currently logs `2018-07-23 17:05:56,775 [INFO][buck_tool.py:541] Starting new Buck daemon...` to the console.
We'd like to simplify what the user sees by showing only `Starting new Buck daemon...`.

Reviewed By: ttsugriy

fbshipit-source-id: 8b1592cc44

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