IPv6 freshness computed for IPv4-only nodes
Freshness is currently computed for both IPv4 and IPv6, irrespective of if the node is IPv4-only, e.g. https://psetf.aglt2.org/etf/check_mk/index.py?start_url=%2Fetf%2Fcheck_mk%2Fview.py%3Fhost%3Dperfsonar02.cmsaf.mit.edu%26service%3DperfSONAR%2520esmond%2520freshness%253A%2520bwctl%26site%3Detf%26view_name%3Dservice