added a new attribute(padoptreallen) for the padN option so that v6test could fake the option length.
added a new attribute(padoptreallen) for the padN option
so that v6test could fake the option length.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame