Configure nova-network database access on debian/ubuntu
Configure nova-network database access on debian/ubuntu

The database configuration disappeared from the debian/ubuntu
installation guide. Add the configuration bits in nova.conf, as done for
other distributions.

Change-Id: I7f7c754c7ff8d6898149507b49efd5a9d51e7ef0
Closes-Bug: #1244216
Backport: havana

saeki-masaki/openstack-manuals,potsmaster/openstack-manuals,Akasurde/openstack-manuals,saeki-masaki/openstack-manuals,gongysh2004/openstack-manual,openstack/openstack-manuals,kairoaraujo/openstack-manuals,gongysh2004/openstack-manual,Akasurde/openstack-manuals,kairoaraujo/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals