hOpenpgp-tools doesn't work since GnuPG 2.1

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.

Original created by @goupille on 16387 (Redmine)

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