northd: Use the same UUID for SB representation of Load_Balancer. #1432

Job	Run time
Prepare container	3m 31s
linux rpm fedora	6m 47s
osx clang --disable-ssl	1m 54s
linux gcc --disable-ssl	2m 41s
linux clang --disable-ssl	2m 41s
linux gcc test -300	9m 17s
linux gcc test 301-600	6m 20s
linux gcc test 601- unstable	6m 20s
linux clang test sanitizers -300	12m 28s
linux clang test sanitizers 301-600	8m 57s
linux clang test sanitizers 601- unstable	10m 52s
linux gcc test -ljemalloc -300	9m 42s
linux gcc test -ljemalloc 301-600	6m 18s
linux gcc test -ljemalloc 601- unstable	6m 42s
linux gcc system-test-dpdk dpdk -100	16m 58s
linux gcc system-test-dpdk dpdk 101- unstable	14m 4s
linux gcc system-test-userspace -100	16m 6s
linux gcc system-test-userspace 101- unstable	13m 10s
linux gcc system-test -100	18m 27s
linux gcc system-test 101- unstable	16m 43s
linux clang system-test sanitizers -100	20m 9s
linux clang system-test sanitizers 101- unstable	18m 33s
linux x86 gcc --disable-ssl	2m 34s
	3h 51m 14s

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