this tool allows to have delegated dns domain to opennebula with dns names for every vm.
vm dns names with vmid look like 3456.vms.my.domain.int. additionaly, there are dns names based on vm name with truncated suffix with vmid. this has sideefect for vms with the same base name - it allow having round robin ballancing.
currently we use /etc/hosts.dnsmasq to not interferre with system /etc/hosts. using hosts file has some drawbacks, like nonexistent wildcards.