HTTPS enabled for remaining OpenJDK subdomains

[mark.reinhold at oracle.com]

We’ve enabled HTTPS for {cr,hg,mail}.openjdk.java.net, and
for openjdk.java.net itself:

  https://cr.openjdk.java.net
  https://hg.openjdk.java.net
  https://mail.openjdk.java.net
  https://openjdk.java.net

Please try using HTTPS with these subdomains, and report any
problems to ops at openjdk.java.net.  After we shake these out
for a couple of weeks we’ll configure redirects and policies
so that these subdomains are HTTPS-by-default.

- Mark