Merge branch 'tz/test-prepare-gnupghome'

Tests did not set up GNUPGHOME correctly, which is fixed but some flaky tests are exposed in t1016, which needs to be addressed before this topic can move forward. * tz/test-prepare-gnupghome: t/lib-gpg: call prepare_gnupghome() in GPG2 prereq t/lib-gpg: add prepare_gnupghome() to create GNUPGHOME dir