northd: fix missing port up when deleting and adding back an lsp #2509

Job	Run time
osx clang --disable-ssl	4m 19s
dpdk gcc	8s
linux rpm fedora	6m 50s
linux gcc --disable-ssl	1m 50s
linux clang --disable-ssl	1m 53s
linux gcc test -300	8m 20s
linux gcc test 301-600	5m 30s
linux gcc test 601- unstable	5m 4s
linux clang test sanitizers -300	11m 22s
linux clang test sanitizers 301-600	8m 5s
linux clang test sanitizers 601- unstable	8m 50s
linux gcc test -ljemalloc -300	8m 40s
linux gcc test -ljemalloc 301-600	5m 39s
linux gcc test -ljemalloc 601- unstable	5m 17s
linux gcc system-test-dpdk dpdk -100	12m 43s
linux gcc system-test-dpdk dpdk 101- unstable	12m 8s
linux gcc system-test-userspace -100	11m 36s
linux gcc system-test-userspace 101- unstable	11m 17s
linux gcc system-test -100	14m 7s
linux gcc system-test 101- unstable	12m 25s
linux clang system-test sanitizers -100	16m 2s
linux clang system-test sanitizers 101- unstable	14m 10s
linux x86 gcc --disable-ssl	1m 50s
	3h 8m 5s

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