auto merge of #4053 : mttr/servo/reftests_with_relative_dir, r=SimonSapin
auto merge of #4053 : mttr/servo/reftests_with_relative_dir, r=SimonSapin

Fixes #3521

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314/servo,runarberg/servo,akosel/servo,ConnorGBrewster/servo,snf/servo,emilio/servo,wpgallih/servo,KiChjang/servo,thiagopnts/servo,jimberlage/servo,boghison/servo,tafia/servo,mt2d2/servo,emilio/servo,s142857/servo,evilpie/servo,michaelwu/servo,brendandahl/servo,samfoo/servo,j3parker/servo,shrenikgala/servo,thiagopnts/servo,avadacatavra/servo,dagnir/servo,ryancanhelpyou/servo,tafia/servo,CJ8664/servo,ryancanhelpyou/servo,nrc/servo,ruud-v-a/servo,fiji-flo/servo,hyowon/servo,deokjinkim/servo,dati91/servo,mattnenterprise/servo,splav/servo,jlegendary/servo,rixrix/servo,pyecs/servo,s142857/servo,A-deLuna/servo,steveklabnik/servo,nick-thompson/servo,wpgallih/servo,Shraddha512/servo,CJ8664/servo,karlito40/servo,larsbergstrom/servo,mattnenterprise/servo,AnthonyBroadCrawford/servo,saneyuki/servo,samfoo/servo,SimonSapin/servo,RenaudParis/servo,indykish/servo,jlegendary/servo,pyecs/servo,deokjinkim/servo,dagnir/servo,brendandahl/servo,tschneidereit/servo,pgonda/servo,nrc/servo,avadacatavra/servo,dvberkel/servo,karlito40/servo,evilpie/servo,walac/servo,wartman4404/servo,rnestler/servo,tempbottle/servo,GreenRecycleBin/servo,Shraddha512/servo,mbrubeck/servo,kindersung/servo,SimonSapin/servo,srbhklkrn/SERVOENGINE,ryancanhelpyou/servo,WriterOfAlicrow/servo,notriddle/servo,fiji-flo/servo,dhananjay92/servo,pyecs/servo,dati91/servo,samfoo/servo,notriddle/servo,huonw/servo,mbrubeck/servo,rnestler/servo,caldwell/servo,splav/servo,nnethercote/servo,fiji-flo/servo,sadmansk/servo,Adenilson/prototype-viewing-distance,saneyuki/servo,luniv/servo,brendandahl/servo,dati91/servo,rixrix/servo,aidanhs/servo,dmarcos/servo,sadmansk/servo,samfoo/servo,cbrewster/servo,froydnj/servo,larsbergstrom/servo,wartman4404/servo,wartman4404/servo,upsuper/servo,canaltinova/servo,peterjoel/servo,pgonda/servo,indykish/servo,paulrouget/servo,eddyb/servo,huonw/servo,eddyb/servo,eddyb/servo,saneyuki/servo,nick-thompson/servo,indykish/servo