Fix wrong command to define neutron firewall class
Fix wrong command to define neutron firewall class

The firewall_driver option in the OVS configuration file was not properly
defined for rpm based distributions: the key word was missing in the
openstack-config command, and the section name was incorrect.

Change-Id: I5346b3ddb39ae961437f0b675043130a8a5dcb5f
Closes-Bug: #1281177
backport: none

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