northd: Short sleeps to accumulate more IDL updates per run. #146

Job	Run time
osx clang --disable-ssl	6m 22s
dpdk gcc	4m 25s
linux rpm fedora	10m 37s
linux gcc --disable-ssl	3m 3s
linux clang --disable-ssl	2m 45s
linux gcc test -500	26m 45s
linux gcc test 501-1000	11m 46s
linux gcc test 1001-	8m 17s
linux clang test sanitizers -300	19m 34s
linux clang test sanitizers 301-600	26m 19s
linux clang test sanitizers 601-900	14m 51s
linux clang test sanitizers 901-1200	11m 42s
linux clang test sanitizers 1201-	10m 27s
linux gcc test -ljemalloc -500	30m 26s
linux gcc test -ljemalloc 501-1000	12m 34s
linux gcc test -ljemalloc 1001-	6m 36s
linux gcc system-test-dpdk dpdk -100	17m 4s
linux gcc system-test-dpdk dpdk 101-200	26m 9s
linux gcc system-test-dpdk dpdk 201-	25m 3s
linux gcc system-test-userspace -100	16m 11s
linux gcc system-test-userspace 101-200	23m 58s
linux gcc system-test-userspace 201-	22m 16s
linux gcc system-test -100	16m 22s
linux gcc system-test 101-200	24m 47s
linux gcc system-test 201-	26m 58s
linux clang system-test sanitizers -100	19m 15s
linux clang system-test sanitizers 101-200	27m 18s
linux clang system-test sanitizers 201-	29m 35s
linux x86 gcc --disable-ssl	3m 40s
	8h 5m 5s

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