northd: Add node for IGMP and Multicast data. #4817

Job	Run time
Prepare container	3m 30s
osx clang --disable-ssl	2m 26s
linux rpm fedora	6m 53s
linux gcc --disable-ssl	2m 49s
linux clang --disable-ssl	2m 53s
linux gcc test -300	10m 8s
linux gcc test 301-600	6m 51s
linux gcc test 601- unstable	7m 40s
linux clang test sanitizers -300	13m 16s
linux clang test sanitizers 301-600	9m 36s
linux clang test sanitizers 601- unstable	12m 13s
linux gcc test -ljemalloc -300	10m 11s
linux gcc test -ljemalloc 301-600	6m 56s
linux gcc test -ljemalloc 601- unstable	7m 30s
linux gcc system-test-dpdk dpdk -100	16m 58s
linux gcc system-test-dpdk dpdk 101- unstable	14m 53s
linux gcc system-test-userspace -100	16m 0s
linux gcc system-test-userspace 101- unstable	13m 47s
linux gcc system-test -100	18m 23s
linux gcc system-test 101- unstable	17m 57s
linux clang system-test sanitizers -100	20m 36s
linux clang system-test sanitizers 101- unstable	20m 20s
linux x86 gcc --disable-ssl	2m 42s
	4h 4m 28s

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