[action] [PR:3045] [intfsorch] Enable ipv6 proxy ndp along with proxy arp (#3045) #3065
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setting SAI_VLAN_ATTR_UNKNOWN_MULTICAST_FLOOD_CONTROL_TYPE to
SAI_VLAN_FLOOD_CONTROL_TYPE_NONE when proxy arp is enabled. This fixes a
bug where ipv6 NS packets were flooding ports with duplicate packets. We
now set multicast flood type to none.