Fix pack permissions when running st2-self-check
Fix pack permissions when running st2-self-check

Without permissions running workflow examples in BWC fails with API 500 error

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