This is a continuation of the effort to update all our URLs to the new top-level domain.

This patch updates (most) URLs in testing code. There still exists references to openjdk.java.net, but that are not strictly used as normal URLs, which I deemed need special care, so I left them out of this one, which is more of a straight-forward search and replace.

I have manually verified that the links work (or points to bugs.openjdk.org and looks sane; I did not click on all those). I have replaced `http` with `https`. I have replaced links to specific commits on the mercurial server with links to the corresponding commits in the new git repos.