GnuPG can't talk to keyservers on Stretch

That’s a know bug in current src:gnupg2: dirmngr gets IPv6 addresses from DNS, tries to connect but can’t since Tor disables IPv6 communication by default. The easiest workaround is to use a .onion keyserver.

Related issues

Related to #12068 (closed)
Related to #12211 (closed)
Blocks #11948 (closed)

Original created by @intrigeri on 12202 (Redmine)

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