NN UI should link DN web address using hostnames

The new NN UI shows links to DN web pages, but since the link is from the info address returned from jmx, it is in the IP address:port form. This breaks if users are using filters utilizing cookies.

Since this is a new feature in 2.8, I didn't mark it as a blocker. I.e. it does not break any existing functions. It just doesn't work properly in certain environments.