When the TC merged I2637dd714cbb6d38ef8b8dc1083e359207118284 we're supposed to invoke stestr rather than testr so lets do that Change-Id: I219b3c448aae6df010cdccced1b9072dc6db0729
Partially implements: blueprint mistral-custom-actions-api Change-Id: I8730e506f0a160450e47a88ca11953b8895181b9