':see: https://github.com/andresriancho/w3af/issues/580
:see: Mostly used in Mutant._create_mutants_worker
:yield: Tuples with:
- A copy of self
- A token set to the right location in the copy of self'

def iter_bound_tokens(self):

    for (key, val, token_path, setter) in self.iter_setters():
        dcc = copy.deepcopy(self)
        token = dcc.set_token(token_path)
        (yield (dcc, token))
