northd: Use the same UUID for SB representation of Load_Balancer. #1427

Job	Run time
Prepare container	4m 5s
linux rpm fedora	6m 40s
osx clang --disable-ssl	1m 53s
linux gcc --disable-ssl	2m 39s
linux clang --disable-ssl	2m 38s
linux gcc test -300	9m 21s
linux gcc test 301-600	6m 13s
linux gcc test 601- unstable	6m 18s
linux clang test sanitizers -300	12m 29s
linux clang test sanitizers 301-600	9m 0s
linux clang test sanitizers 601- unstable	11m 12s
linux gcc test -ljemalloc -300	9m 33s
linux gcc test -ljemalloc 301-600	6m 34s
linux gcc test -ljemalloc 601- unstable	6m 19s
linux gcc system-test-dpdk dpdk -100	17m 2s
linux gcc system-test-dpdk dpdk 101- unstable	14m 13s
linux gcc system-test-userspace -100	16m 6s
linux gcc system-test-userspace 101- unstable	13m 9s
linux gcc system-test -100	18m 34s
linux gcc system-test 101- unstable	16m 38s
linux clang system-test sanitizers -100	20m 5s
linux clang system-test sanitizers 101- unstable	18m 39s
linux x86 gcc --disable-ssl	2m 33s
	3h 51m 53s

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