northd: Add node for IGMP and Multicast data. #4803

Job	Run time
Prepare container	3m 24s
linux rpm fedora	6m 56s
osx clang --disable-ssl	2m 14s
linux gcc --disable-ssl	2m 38s
linux clang --disable-ssl	2m 51s
linux gcc test -300	9m 39s
linux gcc test 301-600	6m 44s
linux gcc test 601- unstable	7m 18s
linux clang test sanitizers -300	13m 12s
linux clang test sanitizers 301-600	9m 27s
linux clang test sanitizers 601- unstable	12m 9s
linux gcc test -ljemalloc -300	10m 15s
linux gcc test -ljemalloc 301-600	6m 46s
linux gcc test -ljemalloc 601- unstable	7m 27s
linux gcc system-test-dpdk dpdk -100	16m 56s
linux gcc system-test-dpdk dpdk 101- unstable	14m 58s
linux gcc system-test-userspace -100	15m 56s
linux gcc system-test-userspace 101- unstable	13m 49s
linux gcc system-test -100	18m 27s
linux gcc system-test 101- unstable	18m 8s
linux clang system-test sanitizers -100	20m 25s
linux clang system-test sanitizers 101- unstable	20m 1s
linux x86 gcc --disable-ssl	2m 44s
	4h 2m 24s

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