A system upgrade broke ostestr. We can fix it by just calling stestr directly. Change-Id: I924488478eeb61a3cb2976e294c7015f933d8258
When the TC merged I2637dd714cbb6d38ef8b8dc1083e359207118284 we're supposed to invoke stestr rather than testr so lets do that Change-Id: I151eb37008936358bd4108a2510c924c261dba8e