[Merge] lp:~dmitrij.ledkov/ubuntu-dev-tools/gnupginterface-is-evil into lp:ubuntu-dev-tools

[Colin Watson]

You could also just use subprocess, for the sake of having lighter
dependencies - I did that in ubuntu-release-upgrader.  python-gnupg is
currently in universe so this change would require an MIR.

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https://code.launchpad.net/~dmitrij.ledkov/ubuntu-dev-tools/gnupginterface-is-evil/+merge/122402
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