Merge branch 'st/verify-tag'

Unify internal logic between "git tag -v" and "git verify-tag" commands by making one directly call into the other. * st/verify-tag: tag -v: verify directly rather than exec-ing verify-tag verify-tag: move tag verification code to tag.c verify-tag: prepare verify_tag for libification verify-tag: update variable name and type t7030: test verifying multiple tags builtin/verify-tag.c: ignore SIGPIPE in gpg-interface