Adapt GnuPG automated tests after switching to an Onion keyserver

Originally created by @anonym on #12211 (Redmine)

Our use of Chutney prevents us from accessing the configured keyserver, since its onion lives on the real Tor network.

Feature Branch: test/12211-local-keyserver-onion

Parent Task: #12210

Edited May 15, 2020 by anonym

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