Rename log function to __log
Rename log function to __log

Reviewed By: tyao1

Differential Revision: D22517530

fbshipit-source-id: 5b6e9e11e0a66a8e41ad57a173f670c639e8f50a

voideanvalue/relay,facebook/relay,xuorig/relay,wincent/relay,kassens/relay,atxwebs/relay,yungsters/relay,xuorig/relay,yungsters/relay,voideanvalue/relay,wincent/relay,kassens/relay,josephsavona/relay,wincent/relay,atxwebs/relay,kassens/relay,atxwebs/relay,yungsters/relay,kassens/relay,wincent/relay,facebook/relay,voideanvalue/relay,kassens/relay,wincent/relay,xuorig/relay,facebook/relay,kassens/relay,voideanvalue/relay,xuorig/relay,josephsavona/relay,voideanvalue/relay,xuorig/relay,facebook/relay,xuorig/relay,wincent/relay,atxwebs/relay,josephsavona/relay,facebook/relay,voideanvalue/relay,facebook/relay