Since Newton the DHCP agent may call dhcp_release6 binary (added in dnsmasq 2.76) so we need this new version in repository Blocked bug is the openstack-neutron spec update to depend on this version
We only ship dnsmasq-utils. dnsmasq (base) comes from RHEL 7.
According to our records, this should be resolved by dnsmasq-2.76-2.el7_4.2. This build is available now.