Urgent matter with GNU ELPA keys

[Stefan Monnier]

I just saw that the GNU ELPA signing key that we distribute with Emacs
(stored in etc/package-keyring.gpg) will expire in September.

It's easy to change elpa.gnu.org to sign with a new key, but the hard
part that we need to take care of ASAP is to figure out how we're going
to let users of already-distributed Emacsen access GNU ELPA when that
new key is used.

My GPG-fu is rather weak, so I need help,


        Stefan