Merge branch 'jk/repo-info-path-keys'

The "git repo info" command has been taught new keys to output both absolute and relative paths for "gitdir" and "commondir", supported by a new path-formatting helper extracted from "git rev-parse". * jk/repo-info-path-keys: repo: add path.gitdir with absolute and relative suffix formatting repo: add path.commondir with absolute and relative suffix formatting path: extract format_path() and use in rev-parse