Add a new test for Python runner which tests a scenario where some configs values are overriden in a datastore.
Add a new test for Python runner which tests a scenario where some configs
values are overriden in a datastore.

Plexxi/st2,peak6/st2,nzlosh/st2,punalpatel/st2,tonybaloney/st2,Plexxi/st2,StackStorm/st2,lakshmi-kannan/st2,pixelrebel/st2,punalpatel/st2,emedvedev/st2,emedvedev/st2,StackStorm/st2,Plexxi/st2,pixelrebel/st2,tonybaloney/st2,lakshmi-kannan/st2,pixelrebel/st2,nzlosh/st2,Plexxi/st2,StackStorm/st2,nzlosh/st2,punalpatel/st2,StackStorm/st2,peak6/st2,tonybaloney/st2,lakshmi-kannan/st2,peak6/st2,emedvedev/st2,nzlosh/st2