northd: Do not attempt to install LS flows for LR IGMP group. #4801

Job	Run time
linux rpm fedora	7m 18s
osx clang --disable-ssl	2m 8s
Prepare container	3m 23s
linux gcc --disable-ssl	2m 36s
linux clang --disable-ssl	2m 45s
linux gcc test -300	9m 33s
linux gcc test 301-600	6m 51s
linux gcc test 601- unstable	7m 2s
linux clang test sanitizers -300	13m 3s
linux clang test sanitizers 301-600	9m 38s
linux clang test sanitizers 601- unstable	12m 3s
linux gcc test -ljemalloc -300	10m 12s
linux gcc test -ljemalloc 301-600	6m 48s
linux gcc test -ljemalloc 601- unstable	7m 27s
linux gcc system-test-dpdk dpdk -100	17m 6s
linux gcc system-test-dpdk dpdk 101- unstable	14m 57s
linux gcc system-test-userspace -100	16m 5s
linux gcc system-test-userspace 101- unstable	13m 56s
linux gcc system-test -100	18m 23s
linux gcc system-test 101- unstable	18m 17s
linux clang system-test sanitizers -100	20m 27s
linux clang system-test sanitizers 101- unstable	20m 22s
linux x86 gcc --disable-ssl	2m 37s
	4h 2m 57s

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