Update tox.ini to use new features

Per this email message from Monty:

http://lists.openstack.org/pipermail/openstack-dev/2013-September/015495.html

We need to duplicate the changes from this review:

https://review.openstack.org/47848

Change-Id: I82b3cc16e554d21fbb642629f8d021c8b1e50b87
[ADMIN_API]: More AF dual LB fixes and errmsg

Several modifications to get the DB status right for failed devices
that failover having both an HTTP and TCP load balancer attached.
Also changed statusDescription to errmsg on the database side.

Change-Id: Icf7fd03434119a668c421fa3a9dc1b3e49808070