Merge branch 'jk/config-parsing-cleanup'

Configuration parsing for tar.* configuration variables were broken. Introduce a new config-keyname parser API to make the callers much less error prone. * jk/config-parsing-cleanup: reflog: use parse_config_key in config callback help: use parse_config_key for man config submodule: simplify memory handling in config parsing submodule: use parse_config_key when parsing config userdiff: drop parse_driver function convert some config callbacks to parse_config_key archive-tar: use parse_config_key when parsing config config: add helper function for parsing key names