Trivial: improve ad-hoc action test
Trivial: improve ad-hoc action test

Make it more readable and representative of various cases.

Change-Id: Ib8cb4fe188d8ef65a0dca9d5b34d0fa9b8a6389d

openstack/mistral,dennybaa/mistral,openstack/mistral,StackStorm/mistral,dennybaa/mistral,StackStorm/mistral