[pkg-gnupg-maint] use a temporary $GNUPGHOME for test suites

[Daniel Kahn Gillmor]

Control: affects 862071 + src:gnupg2

Upstream's recommendation is currently to use a temporary $GNUPGHOME
(with a short path) for test suites which depend on GnuPG with an
ephemeral homedir.

          --dkg
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