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mcastmngr: pass max groups parameter to mcproxy

Anatoly Mirin requested to merge mirin/mcast_pass_max_groups into devel

Setting '/proc/sys/net/ipv4/igmp_max_memberships' is not enough. We must pass the max_groups parameter to the mcproxy to prevent MFC entries from being added to mr_table and packet forwarding for extra groups.

We also need to increase max_groups, since mcproxy always subscribe two service groups - ALL-ROUTERS (224.0.0.2) and ALL-IGMPv3-MC-ROUTERS (224.0.0.22).

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