Allow upstream to receive query and report IGMP messages #3
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RFC4605 section 4.1 states "The proxy device performs the host portion of the IGMP/MLD protocol on the upstream interface", and RFC2236 section 6 states "All other events, such as receiving invalid IGMP messages, or IGMP messages other than Query or Report, are ignored in all states".
This change unbreaks an IPTV setup.