Cleanup worktree related stuff on runner post_run().
Cleanup worktree related stuff on runner post_run().

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