Fix failing Travis
Fix failing Travis

Summary:Process environment variables are mutable so we should not use it to determine equality.

Closes https://github.com/facebook/FBSimulatorControl/pull/252

Reviewed By: lawrencelomax

Differential Revision: D3144145

Pulled By: marekcirkos

fb-gh-sync-id: 36d693ebbe4b6490c54bfbb560d4480fbaa28e12
fbshipit-source-id: 36d693ebbe4b6490c54bfbb560d4480fbaa28e12

StevenUpForever/FBSimulatorControl,plu/FBSimulatorControl,plu/FBSimulatorControl,StevenUpForever/FBSimulatorControl,plu/FBSimulatorControl,facebook/FBSimulatorControl,plu/FBSimulatorControl,bootstraponline/FBSimulatorControl,bootstraponline/FBSimulatorControl,StevenUpForever/FBSimulatorControl,facebook/FBSimulatorControl,bootstraponline/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,bootstraponline/FBSimulatorControl,ichu501/FBSimulatorControl,StevenUpForever/FBSimulatorControl