northd: Fix recompute of referenced chassis in HA chassis groups. #151

Job	Run time
osx clang --disable-ssl	5m 40s
linux gcc --disable-ssl	4m 17s
linux clang --disable-ssl	3m 16s
linux gcc test -500	23m 53s
linux gcc test 501-1000	12m 26s
linux gcc test 1001-	9m 42s
linux clang test sanitizers -300	19m 28s
linux clang test sanitizers 301-600	22m 15s
linux clang test sanitizers 601-900	12m 7s
linux clang test sanitizers 901-1200	11m 5s
linux clang test sanitizers 1201-	7m 20s
linux gcc test -ljemalloc -500	23m 18s
linux gcc test -ljemalloc 501-1000	14m 40s
linux gcc test -ljemalloc 1001-	9m 57s
linux clang test -ljemalloc -500	29m 12s
linux clang test -ljemalloc 501-1000	14m 16s
linux clang test -ljemalloc 1001-	7m 45s
linux gcc system-test -100	15m 47s
linux gcc system-test 101-200	21m 7s
linux gcc system-test 201-	18m 21s
linux clang system-test sanitizers -100	20m 51s
linux clang system-test sanitizers 101-200	24m 45s
linux clang system-test sanitizers 201-	19m 41s
linux gcc m32 --disable-ssl	4m 13s
	5h 55m 22s

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