static String[] toConfigModelsPluginDir(String configModelsPluginDirString) {
        return multiValueParameterStream(configModelsPluginDirString).toArray(String[]::new);
    }
@Test
    public void string_arrays_are_split_on_spaces() {
        String[] parsed = toConfigModelsPluginDir("/home/vespa/foo /home/vespa/bar ");
        assertEquals(2, parsed.length);
    }