northd: Don't monitor northbound external IDs. #229

Job	Run time
Prepare container	3m 31s
linux rpm fedora	7m 54s
osx clang --disable-ssl	2m 38s
linux gcc --disable-ssl	2m 43s
linux clang --disable-ssl	2m 38s
linux gcc test -300	8m 59s
linux gcc test 301-600	6m 16s
linux gcc test 601- unstable	6m 24s
linux clang test sanitizers -300	12m 38s
linux clang test sanitizers 301-600	9m 10s
linux clang test sanitizers 601- unstable	14m 20s
linux gcc test -ljemalloc -300	10m 4s
linux gcc test -ljemalloc 301-600	6m 35s
linux gcc test -ljemalloc 601- unstable	6m 42s
linux gcc system-test-dpdk dpdk -100	16m 39s
linux gcc system-test-dpdk dpdk 101- unstable	14m 20s
linux gcc system-test-userspace -100	16m 2s
linux gcc system-test-userspace 101- unstable	12m 58s
linux gcc system-test -100	20m 2s
linux gcc system-test 101- unstable	16m 47s
linux clang system-test sanitizers -100	23m 16s
linux clang system-test sanitizers 101- unstable	18m 39s
linux x86 gcc --disable-ssl	2m 34s
	4h 1m 49s

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