Clean files from any generated output dir we touch
Clean files from any generated output dir we touch

Reviewed By: kassens

Differential Revision: D4880318

fbshipit-source-id: 96fbcc521f3cb6eb4a711c84943e53b19e85672c

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