Merge branch 'lt/gpg-show-long-key-in-signature-verification-maint' into lt/gpg-show-long-key-in-signature-verification

Linus's original was rebased to apply to the maintenance track just in case binary distributors that are stuck in the past want to take it to their older codebase. Let's merge it up to more modern codebase that has Peff's gpg-interface clean-up topic that appeared after Git 2.9 was tagged. * lt/gpg-show-long-key-in-signature-verification-maint: gpg-interface: prefer "long" key format output when verifying pgp signatures