only enable __id parsing in Relay mode
only enable __id parsing in Relay mode

Reviewed By: tyao1

Differential Revision: D24731706

fbshipit-source-id: e1956251e1e9b96c92bf8f2148c264c898f0fbf7

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