Add a work around for test failure under Python 3.6.5.
Add a work around for test failure under Python 3.6.5.

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