af2f34adfd
We're getting some false positive results on this check and while it was coded to try 3 times given sufficient independent addrs the default url resolves to a single address so we'd just try once. Rework to try again even with fewer urls to try to reduce the false positives. Also adds a random query param to fool proxies into not caching. bug:9972012 Change-Id: Ib719f40ec612065ca6bcd919549fc1164506d35a