Updated openstack/openstack
Project: openstack/taskflow  e182e44d686ac2599d700e604d6e556236403526

Remove less than useful action_engine __str__

The implementation of __str__ does not provide much
useful information so instead just prefer the automatically
provided one which provides equivalent information in
a more well known format...

Change-Id: I0a1683cfc22df1888a19f5af10d7a343462d3994