Same as add_copy_spec, except that it prepends path to SCL root
        to "copyspecs".

def add_copy_spec_scl(self, scl, copyspecs):
        """Same as add_copy_spec, except that it prepends path to SCL root
        to "copyspecs".
        """
        if isinstance(copyspecs, six.string_types):
            copyspecs = [copyspecs]
        scl_copyspecs = []
        for copyspec in copyspecs:
            scl_copyspecs.append(self.convert_copyspec_scl(scl, copyspec))
        self.add_copy_spec(scl_copyspecs)