northd: Add LR option to commit all traffic. #3403

Job	Run time
Prepare container	53s
linux rpm fedora	7m 42s
osx clang --disable-ssl	2m 22s
linux gcc --disable-ssl	2m 36s
linux clang --disable-ssl	2m 41s
linux gcc test -300	10m 6s
linux gcc test 301-600	7m 19s
linux gcc test 601- unstable	7m 36s
linux clang test sanitizers -300	13m 36s
linux clang test sanitizers 301-600	10m 3s
linux clang test sanitizers 601- unstable	12m 59s
linux gcc test -ljemalloc -300	10m 24s
linux gcc test -ljemalloc 301-600	7m 31s
linux gcc test -ljemalloc 601- unstable	7m 54s
linux gcc system-test-dpdk dpdk -100	17m 15s
linux gcc system-test-dpdk dpdk 101- unstable	17m 31s
linux gcc system-test-userspace -100	16m 4s
linux gcc system-test-userspace 101- unstable	16m 12s
linux gcc system-test -100	18m 54s
linux gcc system-test 101- unstable	21m 48s
linux clang system-test sanitizers -100	20m 38s
linux clang system-test sanitizers 101- unstable	24m 44s
linux x86 gcc --disable-ssl	2m 35s
	4h 19m 23s

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