remove debugging from Env
remove debugging from Env

Summary:
looks like left-over debugging, causes log spew in unit tests

Changelog: [internal]

Reviewed By: SamChou19815

Differential Revision: D37590882

fbshipit-source-id: 41b8a44f70735ac67f25c21a9dec18b35d013111

mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow