Merge branch 'pt/credential-xdg'

Tweak the sample "store" backend of the credential helper to honor XDG configuration file locations when specified. * pt/credential-xdg: t0302: "unreadable" test needs POSIXPERM t0302: test credential-store support for XDG_CONFIG_HOME git-credential-store: support XDG_CONFIG_HOME git-credential-store: support multiple credential files