Automated In-place Cluster Upgrade to 3.6 fails on openshift_node_dnsmasq 'Set dnsIP' task

Issue

• Upgrade from 3.5 to 3.6 fails due to dns

TASK [openshift_node_dnsmasq : Set dnsIP] **************************************
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: KeyError: 'ansible_default_ipv4'
fatal: [testingnode.example.com]: FAILED! => {
    "failed": true
}

• Repeatedly failed, until I changed get_dns_ip method in /usr/share/ansible_plugins/filter_plugins/openshift_node.py to return hostvars['openshift']['node']['dns_ip'] (instead of hostvars['ansible_default_ipv4']['address'])