Add more tests for action executions output API endpoint.
Add more tests for action executions output API endpoint.

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