Comment 2 for bug 1684231

I think this is best addressed by the internal-dns feature outlined in https://specs.openstack.org/openstack/charm-specs/specs/pike/approved/internal-dns.html leveraging the new dns-servers config option.

However, the ability to set dnsmasq-flags across charms that provide for the neutron-dhcp-agent (which runs dnsmasq) should be consistent. As such, this is a bug in that it is missing a function existing elsewhere.