Loosen validation of mutation configs
Loosen validation of mutation configs

This is a manual sync of D2990103 that got dropped by the sync script.

NevilleS/relay,cpojer/relay,cesarandreu/relay,gabelevi/relay,kassens/relay,iamchenxin/relay,mroch/relay,yungsters/relay,xuorig/relay,chentsulin/relay,yungsters/relay,josephsavona/relay,kassens/relay,voideanvalue/relay,voideanvalue/relay,xuorig/relay,facebook/relay,apalm/relay,mroch/relay,zpao/relay,gabelevi/relay,wincent/relay,cesarandreu/relay,apalm/relay,facebook/relay,dbslone/relay,iamchenxin/relay,facebook/relay,zpao/relay,xuorig/relay,chirag04/relay,iamchenxin/relay,xuorig/relay,wincent/relay,kassens/relay,cpojer/relay,atxwebs/relay,dbslone/relay,chentsulin/relay,chirag04/relay,facebook/relay,cpojer/relay,voideanvalue/relay,freiksenet/relay,atxwebs/relay,iamchenxin/relay,zpao/relay,wincent/relay,NevilleS/relay,mroch/relay,freiksenet/relay,facebook/relay,wincent/relay,benjaminogles/relay,benjaminogles/relay,chirag04/relay,josephsavona/relay,josephsavona/relay,atxwebs/relay,wincent/relay,chentsulin/relay,xuorig/relay,freiksenet/relay,yungsters/relay,benjaminogles/relay,cpojer/relay,voideanvalue/relay,rosskevin/relay,gabelevi/relay,facebook/relay,kassens/relay,rosskevin/relay,cesarandreu/relay,NevilleS/relay,xuorig/relay,apalm/relay,wincent/relay,kassens/relay,voideanvalue/relay,voideanvalue/relay,atxwebs/relay,kassens/relay