hOpenpgp-tools doesn't work since GnuPG 2.1

Originally created by @goupille on #16387 (Redmine)

GnuPG 2.1 is storing keys in _{/.gnupg/pubring.kbx, hOpenpgp-tools needs them to be in}/.gnupg/pubring.gpg so it ends up in an error.

Related issues

• Related to #15291 (closed)