Updated openstack/openstack
Project: openstack/ceilometer  935232cc7d7115e3fb31e50b8a66009698e69e11

Use oslo_debug_helper and remove our own version

With the latest version of oslotest, we can now take advantage
of a common oslo_debug_helper script.
We can now remove our own homebrewed version, minor changes to
tox.ini were needed.

Change-Id: Ibd4317e8b1a9e38c9f4ef839352b74f14e9ddcfa