bug#19404: 25.0.50; Gnus shows self-signed certificate warning when connecting to Gmane

[Eli Zaretskii]

> From: David Engster <deng@randomsample.de>
> Cc: 19404@debbugs.gnu.org,  larsi@gnus.org,  dgutov@yandex.ru
> Date: Thu, 18 Dec 2014 22:40:56 +0100
> 
> I see now that :self-signed is mapped to
> GNUTLS_CERT_SIGNER_NOT_FOUND.

Then the text we produce is misleading, IMO.

> http://www.gnutls.org/manual/gnutls.html#gnutls_005fcertificate_005fstatus_005ft
> 
> It simply means: "The certificate’s issuer is not known. This is the
> case if the issuer is not included in the trusted certificate list."

I suggest that we say something like this, indeed.