Fix integration test for mistral workflow rerun
Fix integration test for mistral workflow rerun

The two tests were using the same key value pair and conflict with each other when run concurrently.

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