Remove last_stdout, last_stderr ivars
Remove last_stdout, last_stderr ivars

mvz/aruba,maxmeyer/aruba,dg-ratiodata/aruba,ducthanh/aruba,weedySeaDragon/aruba,jasnow/aruba,cucumber/aruba,ducthanh/aruba,dg-ratiodata/aruba,AdrieanKhisbe/aruba,weedySeaDragon/aruba,e2/aruba,maxmeyer/aruba,jasnow/aruba,AdrieanKhisbe/aruba,dg-ratiodata/aruba,weedySeaDragon/aruba,jasnow/aruba,e2/aruba,mvz/aruba,AdrieanKhisbe/aruba,mattwynne/aruba,weedySeaDragon/aruba,ducthanh/aruba,ducthanh/aruba,e2/aruba,e2/aruba,dg-ratiodata/aruba,jasnow/aruba,rapid7/aruba,AdrieanKhisbe/aruba,rapid7/aruba