Have validate check for the "files written by multiple tests" error
Have validate check for the "files written by multiple tests" error

We don't actually enable the test yet, but when we do validate will
check whether it fails.

holzensp/ghc,TomMD/ghc,sdiehl/ghc,mfine/ghc,nkaretnikov/ghc,TomMD/ghc,green-haskell/ghc,snoyberg/ghc,tjakway/ghcjvm,ezyang/ghc,mcmaniac/ghc,shlevy/ghc,anton-dessiatov/ghc,elieux/ghc,ghc-android/ghc,oldmanmike/ghc,mcmaniac/ghc,vTurbine/ghc,mettekou/ghc,holzensp/ghc,mcschroeder/ghc,sgillespie/ghc,gcampax/ghc,anton-dessiatov/ghc,hferreiro/replay,urbanslug/ghc,nomeata/ghc,lukexi/ghc,nkaretnikov/ghc,AlexanderPankiv/ghc,lukexi/ghc,fmthoma/ghc,TomMD/ghc,nushio3/ghc,ml9951/ghc,snoyberg/ghc,forked-upstream-packages-for-ghcjs/ghc,sgillespie/ghc,nathyong/microghc-ghc,frantisekfarka/ghc-dsi,da-x/ghc,nathyong/microghc-ghc,christiaanb/ghc,ghc-android/ghc,ekmett/ghc,bitemyapp/ghc,AlexanderPankiv/ghc,oldmanmike/ghc,nkaretnikov/ghc,ml9951/ghc,urbanslug/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,hferreiro/replay,forked-upstream-packages-for-ghcjs/ghc,oldmanmike/ghc,GaloisInc/halvm-ghc,sdiehl/ghc,shlevy/ghc,shlevy/ghc,hferreiro/replay,ilyasergey/GHC-XAppFix,ghc-android/ghc,wxwxwwxxx/ghc,christiaanb/ghc,ryantm/ghc,jstolarek/ghc,lukexi/ghc,ryantm/ghc,TomMD/ghc,wxwxwwxxx/ghc,mettekou/ghc,nushio3/ghc,green-haskell/ghc,hferreiro/replay,nkaretnikov/ghc,shlevy/ghc,mcmaniac/ghc,elieux/ghc,gcampax/ghc,fmthoma/ghc,holzensp/ghc,snoyberg/ghc,ml9951/ghc,oldmanmike/ghc,forked-upstream-packages-for-ghcjs/ghc,spacekitteh/smcghc,vTurbine/ghc,nushio3/ghc,christiaanb/ghc,GaloisInc/halvm-ghc,mettekou/ghc,GaloisInc/halvm-ghc,vTurbine/ghc,gcampax/ghc,tjakway/ghcjvm,tibbe/ghc,ekmett/ghc,wxwxwwxxx/ghc,lukexi/ghc-7.8-arm64,lukexi/ghc,snoyberg/ghc,tjakway/ghcjvm,ghc-android/ghc,siddhanathan/ghc,lukexi/ghc-7.8-arm64,siddhanathan/ghc,sgillespie/ghc,ryantm/ghc,AlexanderPankiv/ghc,ezyang/ghc,acowley/ghc,tibbe/ghc,wxwxwwxxx/ghc,christiaanb/ghc,mcschroeder/ghc,da-x/ghc,fmthoma/ghc,hferreiro/replay,spacekitteh/smcghc,urbanslug/ghc,ghc-android/ghc,jstolarek/ghc,vikraman/ghc,anton-dessiatov/ghc,jstolarek/ghc,nomeata/ghc,wxwxwwxxx/ghc,forked-upstream-packages-for-ghcjs/ghc,ezyang/ghc,tibbe/ghc,mcmaniac/ghc,vikraman/ghc,olsner/ghc,sgillespie/ghc,sgillespie/ghc,ml9951/ghc,ml9951/ghc,mfine/ghc,fmthoma/ghc,gcampax/ghc,frantisekfarka/ghc-dsi,ghc-android/ghc,mcschroeder/ghc,ml9951/ghc,gcampax/ghc,vikraman/ghc,anton-dessiatov/ghc,gridaphobe/ghc,olsner/ghc,siddhanathan/ghc,lukexi/ghc-7.8-arm64,vTurbine/ghc,mettekou/ghc,GaloisInc/halvm-ghc,ryantm/ghc,vikraman/ghc,mcmaniac/ghc,nomeata/ghc,anton-dessiatov/ghc,tjakway/ghcjvm,fmthoma/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,christiaanb/ghc,sdiehl/ghc,lukexi/ghc-7.8-arm64,ryantm/ghc,mcschroeder/ghc,hferreiro/replay,mettekou/ghc,da-x/ghc,christiaanb/ghc,sdiehl/ghc,nushio3/ghc,da-x/ghc,forked-upstream-packages-for-ghcjs/ghc,AlexanderPankiv/ghc,anton-dessiatov/ghc,sdiehl/ghc,sgillespie/ghc,AlexanderPankiv/ghc,nkaretnikov/ghc,ml9951/ghc,bitemyapp/ghc,urbanslug/ghc,spacekitteh/smcghc,vTurbine/ghc,siddhanathan/ghc,lukexi/ghc,TomMD/ghc,gridaphobe/ghc,ezyang/ghc,GaloisInc/halvm-ghc,TomMD/ghc,ekmett/ghc,ezyang/ghc,fmthoma/ghc,anton-dessiatov/ghc,ghc-android/ghc,elieux/ghc,frantisekfarka/ghc-dsi,tjakway/ghcjvm,nkaretnikov/ghc,nathyong/microghc-ghc,gridaphobe/ghc,snoyberg/ghc,jstolarek/ghc,sgillespie/ghc,christiaanb/ghc,bitemyapp/ghc,nkaretnikov/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,mfine/ghc,urbanslug/ghc,tibbe/ghc,sdiehl/ghc,mcschroeder/ghc,frantisekfarka/ghc-dsi,ilyasergey/GHC-XAppFix,acowley/ghc,elieux/ghc,olsner/ghc,nushio3/ghc,ekmett/ghc,nomeata/ghc,vTurbine/ghc,gridaphobe/ghc,shlevy/ghc,GaloisInc/halvm-ghc,green-haskell/ghc,nathyong/microghc-ghc,acowley/ghc,holzensp/ghc,holzensp/ghc,mfine/ghc,mettekou/ghc,AlexanderPankiv/ghc,jstolarek/ghc,gcampax/ghc,nomeata/ghc,bitemyapp/ghc,bitemyapp/ghc,nushio3/ghc,da-x/ghc,urbanslug/ghc,da-x/ghc,gridaphobe/ghc,acowley/ghc,elieux/ghc,shlevy/ghc,vikraman/ghc,da-x/ghc,tjakway/ghcjvm,mfine/ghc,shlevy/ghc,frantisekfarka/ghc-dsi,olsner/ghc,spacekitteh/smcghc,wxwxwwxxx/ghc,nushio3/ghc,olsner/ghc,urbanslug/ghc,green-haskell/ghc,olsner/ghc,lukexi/ghc-7.8-arm64,mfine/ghc,TomMD/ghc,oldmanmike/ghc,ilyasergey/GHC-XAppFix,snoyberg/ghc,green-haskell/ghc,mettekou/ghc,hferreiro/replay,siddhanathan/ghc,gridaphobe/ghc,ilyasergey/GHC-XAppFix,mcschroeder/ghc,sdiehl/ghc,nathyong/microghc-ghc,acowley/ghc,vikraman/ghc,nathyong/microghc-ghc,acowley/ghc,elieux/ghc,ezyang/ghc,siddhanathan/ghc,siddhanathan/ghc,fmthoma/ghc,forked-upstream-packages-for-ghcjs/ghc,ekmett/ghc,olsner/ghc,snoyberg/ghc,mcschroeder/ghc,vTurbine/ghc,spacekitteh/smcghc,ezyang/ghc,forked-upstream-packages-for-ghcjs/ghc,vikraman/ghc,gridaphobe/ghc,mfine/ghc,tibbe/ghc,gcampax/ghc,acowley/ghc,ml9951/ghc,nathyong/microghc-ghc,elieux/ghc