Add script for listing available / installed action runners.
Add script for listing available / installed action runners.

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