Comment 5 for bug 1457900

I've dug into dnsmasq manual, and I believe thant '--dhcp-authoritative' should not be used in the neutron dhcp agent.

  -K, --dhcp-authoritative
              Should be set when dnsmasq is definitely the only DHCP server on
              a network. For DHCPv4, it changes the behaviour from strict RFC
              compliance so that DHCP requests on unknown leases from unknown
              hosts are not ignored. This allows new hosts to get a lease
              without a tedious timeout under all circumstances. It also
              allows dnsmasq to rebuild its lease database without each client
              needing to reacquire a lease, if the database is lost. For
              DHCPv6 it sets the priority in replies to 255 (the maximum)
              instead of 0 (the minimum).

As we understand, if there is more than one dnsmasq on the network it will violate --dhcp-authoritative expectations.