northd: Add EVPN ARP/ND suppression for logical switches. #3259

Job	Run time
Prepare container	2m 52s
linux rpm fedora	7m 38s
osx clang --disable-ssl	2m 22s
linux gcc test 301-600	9m 32s
linux clang --disable-ssl	2m 47s
linux gcc test -300	10m 42s
linux gcc --disable-ssl	2m 52s
linux gcc test -ljemalloc -300	12m 2s
linux clang test sanitizers -300	14m 35s
linux gcc system-test -100	18m 21s
linux gcc test 601- unstable	10m 8s
linux gcc dist-test	3m 2s
linux gcc system-test 201- unstable	20m 57s
linux clang test sanitizers 301-600	12m 9s
linux gcc system-test-userspace 201- unstable	17m 28s
linux clang system-test sanitizers 201- unstable	22m 28s
linux x86 gcc --disable-ssl	2m 51s
linux gcc system-test-userspace 101-200	11m 27s
linux gcc system-test 101-200	11m 33s
linux gcc system-test-dpdk dpdk 101-200	12m 37s
linux gcc system-test-userspace -100	17m 44s
linux gcc test -ljemalloc 601- unstable	11m 14s
linux clang system-test sanitizers -100	20m 18s
linux clang test sanitizers 601- unstable	16m 9s
linux clang system-test sanitizers 101-200	13m 47s
linux gcc test -ljemalloc 301-600	9m 34s
linux gcc system-test-dpdk dpdk 201- unstable	18m 34s
linux gcc system-test-dpdk dpdk -100	19m 37s
	5h 35m 20s

Provide feedback