Comment 6 for bug 1861032

We approved this rfe on our last drivers team meeting http://eavesdrop.openstack.org/meetings/neutron_drivers/2020/neutron_drivers.2020-02-07-14.00.log.html#l-15

Two notes to this rfe:
1. This can be implemented in Neutron on when related changes will be merged and released in dnsmasq so this will be probably implemented in V cycle soonest,
1. Brian Haley volunteered to propose doc with gaps between ovn and other backends, please add note about this to such doc when it will be available.