Proposed fix for test failures due to long socket paths

[David Bremner]

David Bremner <david at tethera.net> writes:

> Amadeusz Żołnowski found a bug in the test suite that causes gpg
> failures when the path of the test directory is sufficiently long.
> His current solution in Gentoo is to move the sockets into /tmp. It
> seems cleaner to enable gnupg's built in /run based short pathed
> sockets.  As far as I know the gpgconf option used here is available
> in gnupg 2.1.13 and later. Amadeusz reported that the problem was
> "fixed" in Gentoo by downgrading gnupg to 2.1.15. So while I'm not
> 100% sure, it seems like a fix for very recent gnupg is all that is
> required. Testing of these patches with older gpg would be
> particularly welcome.

Pushed the series (with Tomi's changes) to release and master

d