Discard stty command stderr output so it doesn't polute the terminal and break the tests.
Discard stty command stderr output so it doesn't polute the terminal and break
the tests.

dennybaa/st2,nzlosh/st2,StackStorm/st2,jtopjian/st2,pixelrebel/st2,Plexxi/st2,pinterb/st2,alfasin/st2,jtopjian/st2,emedvedev/st2,StackStorm/st2,grengojbo/st2,pixelrebel/st2,StackStorm/st2,nzlosh/st2,punalpatel/st2,emedvedev/st2,tonybaloney/st2,grengojbo/st2,peak6/st2,punalpatel/st2,Plexxi/st2,dennybaa/st2,tonybaloney/st2,pinterb/st2,Itxaka/st2,alfasin/st2,peak6/st2,Plexxi/st2,armab/st2,pinterb/st2,lakshmi-kannan/st2,Plexxi/st2,StackStorm/st2,lakshmi-kannan/st2,armab/st2,dennybaa/st2,jtopjian/st2,Itxaka/st2,grengojbo/st2,alfasin/st2,punalpatel/st2,lakshmi-kannan/st2,tonybaloney/st2,emedvedev/st2,peak6/st2,nzlosh/st2,pixelrebel/st2,armab/st2,nzlosh/st2,Itxaka/st2