Merge branch 'jk/submodule-subdirectory-ok'

Allow various subcommands of "git submodule" to be run not from the top of the working tree of the superproject. * jk/submodule-subdirectory-ok: submodule: drop the top-level requirement rev-parse: add --prefix option submodule: show full path in error message t7403: add missing && chaining t7403: modernize style t7401: make indentation consistent