Add test which verifies SSH connections are closed in post_run of the remote runner class.
Add test which verifies SSH connections are closed in post_run of the
remote runner class.

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