Try to stop_neutron without /bin/true
Try to stop_neutron without /bin/true

This masked out the real error we would have seen otherwise, see if
services are now shutting down cleanly enough to use this.

Change-Id: Iee8e509d58a22ca9e385d6b818c147088cfe16e9

openstack-dev/grenade,openstack-dev/grenade