Fix RelayError to use type=error instead of type=mustfix
Fix RelayError to use type=error instead of type=mustfix

Reviewed By: kassens

Differential Revision: D19783795

fbshipit-source-id: ca6a4cd408159ec623acc2705a21da88c87c799e

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