Add tests for packs.uninstall action.
Add tests for packs.uninstall action.

nzlosh/st2,Plexxi/st2,StackStorm/st2,nzlosh/st2,StackStorm/st2,StackStorm/st2,tonybaloney/st2,Plexxi/st2,Plexxi/st2,nzlosh/st2,peak6/st2,tonybaloney/st2,peak6/st2,Plexxi/st2,StackStorm/st2,nzlosh/st2,peak6/st2,tonybaloney/st2