Manage dnsmasq_dns_servers option in /etc/neutron/dhcp_agent.ini in OCI

Jim Scaddenrequested to merge
FloydianJim/openstack-cluster-installer:enhancement/neutron-dnsmasq-dns-servers into debian/caracal

Manage dnsmasq_dns_servers option in /etc/neutron/dhcp_agent.ini

This enables the user to configure Case 2a from https://docs.openstack.org/neutron/latest/admin/config-dns-res.html

README.md has been updated to document the use of the new cluster option (--neutron-dnsmasq-dns-servers)

Associated BTS https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1066862

Edited by Jim Scadden

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