Ignore all args when Ellipsis is passed

[ivancrneto]

We want to be able to do the following:

class TestOs:
    def test_chflags(self):
        with stubout(os, "chflags") as m_chflags, expect:
            m_chflags(...).and_return("1")

        assert os.chflags('/home/', 644, True) == "1"
        mox.verify(m_chflags)

Right now we get the following:

E           mox.exceptions.UnexpectedMethodCallError: Unexpected method call.  unexpected:-  expected:+
E           - builtin_function_or_method.__call__('/home/', 644, True) -> None
E           + builtin_function_or_method.__call__(Ellipsis) -> '1'
E           ?      

So, when passing ..., we should, ignore the parameters, just verify the calls were made. It would be the same of doing:

            m_chflags(mox.ignore_arg(), mox.ignore_arg(), mox.ignore_arg()).and_return("1")