DRAFT OpenStack upgrades aren't easy, until Folsom they weren't even supported. This howto will drive you to upgrade from grizzly to havana, on a wheezy system(s). The upgrade will be performed offline, all services will be down during it. This howto was modeled after our upgrade, we use postgresql for the database, we keep our users, tenants/projects and passwords in ldap and we use ceph as the b