Add DB model UID tests for policy models.
Add DB model UID tests for policy models.

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