pinctrl: Send periodic arp/nd to ecmp next-hops. #4760

Job	Run time
Prepare container	3m 34s
linux rpm fedora	11m 41s
osx clang --disable-ssl	1m 58s
linux gcc --disable-ssl	2m 36s
linux clang --disable-ssl	2m 43s
linux gcc test -300	9m 35s
linux gcc test 301-600	6m 36s
linux gcc test 601- unstable	6m 47s
linux clang test sanitizers -300	12m 54s
linux clang test sanitizers 301-600	9m 13s
linux clang test sanitizers 601- unstable	11m 32s
linux gcc test -ljemalloc -300	9m 53s
linux gcc test -ljemalloc 301-600	6m 40s
linux gcc test -ljemalloc 601- unstable	6m 49s
linux gcc system-test-dpdk dpdk -100	16m 52s
linux gcc system-test-dpdk dpdk 101- unstable	14m 51s
linux gcc system-test-userspace -100	15m 51s
linux gcc system-test-userspace 101- unstable	13m 47s
linux gcc system-test -100	18m 29s
linux gcc system-test 101- unstable	18m 2s
linux clang system-test sanitizers -100	20m 21s
linux clang system-test sanitizers 101- unstable	19m 57s
linux x86 gcc --disable-ssl	2m 32s
	4h 3m 13s

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