Fix Groovy batch arguments
Fix Groovy batch arguments

Makes two changes to our groovy arguments

1. Prefer - over / which will let us remove our hacky argument change
legacy script.
1. Use the positive -testDesktop over -skipCoreClr verbs

tmat/roslyn,jcouv/roslyn,MichalStrehovsky/roslyn,tmeschter/roslyn,heejaechang/roslyn,genlu/roslyn,abock/roslyn,swaroop-sridhar/roslyn,abock/roslyn,stephentoub/roslyn,bkoelman/roslyn,reaction1989/roslyn,dotnet/roslyn,jamesqo/roslyn,cston/roslyn,orthoxerox/roslyn,ErikSchierboom/roslyn,lorcanmooney/roslyn,tmeschter/roslyn,jkotas/roslyn,xasx/roslyn,xasx/roslyn,panopticoncentral/roslyn,CaptainHayashi/roslyn,mattwar/roslyn,agocke/roslyn,CyrusNajmabadi/roslyn,jasonmalinowski/roslyn,tvand7093/roslyn,tmat/roslyn,TyOverby/roslyn,yeaicc/roslyn,MattWindsor91/roslyn,CaptainHayashi/roslyn,dpoeschl/roslyn,cston/roslyn,tvand7093/roslyn,CyrusNajmabadi/roslyn,orthoxerox/roslyn,nguerrera/roslyn,jasonmalinowski/roslyn,gafter/roslyn,MattWindsor91/roslyn,bkoelman/roslyn,mattwar/roslyn,robinsedlaczek/roslyn,jcouv/roslyn,jmarolf/roslyn,VSadov/roslyn,bartdesmet/roslyn,ErikSchierboom/roslyn,yeaicc/roslyn,mattscheffer/roslyn,drognanar/roslyn,Hosch250/roslyn,sharwell/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,tannergooding/roslyn,weltkante/roslyn,KevinRansom/roslyn,reaction1989/roslyn,srivatsn/roslyn,mgoertz-msft/roslyn,eriawan/roslyn,amcasey/roslyn,dotnet/roslyn,OmarTawfik/roslyn,swaroop-sridhar/roslyn,Hosch250/roslyn,physhi/roslyn,pdelvo/roslyn,Giftednewt/roslyn,diryboy/roslyn,MattWindsor91/roslyn,weltkante/roslyn,panopticoncentral/roslyn,tvand7093/roslyn,lorcanmooney/roslyn,mattwar/roslyn,shyamnamboodiripad/roslyn,dpoeschl/roslyn,diryboy/roslyn,amcasey/roslyn,srivatsn/roslyn,jkotas/roslyn,aelij/roslyn,aelij/roslyn,TyOverby/roslyn,jmarolf/roslyn,mmitche/roslyn,AnthonyDGreen/roslyn,bkoelman/roslyn,shyamnamboodiripad/roslyn,AlekseyTs/roslyn,aelij/roslyn,OmarTawfik/roslyn,jkotas/roslyn,KevinRansom/roslyn,Giftednewt/roslyn,mgoertz-msft/roslyn,CaptainHayashi/roslyn,sharwell/roslyn,mgoertz-msft/roslyn,swaroop-sridhar/roslyn,brettfo/roslyn,MichalStrehovsky/roslyn,brettfo/roslyn,khyperia/roslyn,wvdd007/roslyn,bartdesmet/roslyn,paulvanbrenk/roslyn,davkean/roslyn,tannergooding/roslyn,robinsedlaczek/roslyn,stephentoub/roslyn,CyrusNajmabadi/roslyn,jamesqo/roslyn,MichalStrehovsky/roslyn,gafter/roslyn,eriawan/roslyn,jasonmalinowski/roslyn,jcouv/roslyn,pdelvo/roslyn,AnthonyDGreen/roslyn,mmitche/roslyn,xasx/roslyn,genlu/roslyn,VSadov/roslyn,wvdd007/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,VSadov/roslyn,orthoxerox/roslyn,robinsedlaczek/roslyn,drognanar/roslyn,bartdesmet/roslyn,kelltrick/roslyn,paulvanbrenk/roslyn,jamesqo/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,yeaicc/roslyn,davkean/roslyn,TyOverby/roslyn,KirillOsenkov/roslyn,paulvanbrenk/roslyn,MattWindsor91/roslyn,stephentoub/roslyn,weltkante/roslyn,pdelvo/roslyn,physhi/roslyn,nguerrera/roslyn,Hosch250/roslyn,KirillOsenkov/roslyn,dpoeschl/roslyn,wvdd007/roslyn,AnthonyDGreen/roslyn,tmat/roslyn,tmeschter/roslyn,agocke/roslyn,abock/roslyn,heejaechang/roslyn,heejaechang/roslyn,mavasani/roslyn,mattscheffer/roslyn,KevinRansom/roslyn,DustinCampbell/roslyn,physhi/roslyn,kelltrick/roslyn,sharwell/roslyn,DustinCampbell/roslyn,shyamnamboodiripad/roslyn,nguerrera/roslyn,agocke/roslyn,AmadeusW/roslyn,diryboy/roslyn,jmarolf/roslyn,davkean/roslyn,brettfo/roslyn,panopticoncentral/roslyn,AlekseyTs/roslyn,mmitche/roslyn,khyperia/roslyn,OmarTawfik/roslyn,reaction1989/roslyn,ErikSchierboom/roslyn,kelltrick/roslyn,drognanar/roslyn,mattscheffer/roslyn,gafter/roslyn,mavasani/roslyn,DustinCampbell/roslyn,Giftednewt/roslyn,cston/roslyn,eriawan/roslyn,AmadeusW/roslyn,srivatsn/roslyn,genlu/roslyn,amcasey/roslyn,dotnet/roslyn,AlekseyTs/roslyn,khyperia/roslyn,KirillOsenkov/roslyn,AmadeusW/roslyn,lorcanmooney/roslyn,tannergooding/roslyn,mavasani/roslyn