northd: lflow-mgr: Allocate DP reference counters on a second use. #173

Job	Run time
osx clang --disable-ssl	5m 27s
Prepare container	2m 6s
linux rpm fedora	7m 4s
dpdk gcc	3s
linux gcc --disable-ssl	2m 14s
linux clang --disable-ssl	2m 22s
linux gcc test -300	9m 1s
linux gcc test 301-600	6m 1s
linux gcc test 601- unstable	5m 51s
linux clang test sanitizers -300	11m 38s
linux clang test sanitizers 301-600	8m 42s
linux clang test sanitizers 601- unstable	9m 39s
linux gcc test -ljemalloc -300	9m 20s
linux gcc test -ljemalloc 301-600	6m 6s
linux gcc test -ljemalloc 601- unstable	5m 49s
linux gcc system-test-dpdk dpdk -100	13m 2s
linux gcc system-test-dpdk dpdk 101- unstable	12m 55s
linux gcc system-test-userspace -100	11m 55s
linux gcc system-test-userspace 101- unstable	11m 44s
linux gcc system-test -100	14m 22s
linux gcc system-test 101- unstable	12m 50s
linux clang system-test sanitizers -100	16m 20s
linux clang system-test sanitizers 101- unstable	14m 42s
linux x86 gcc --disable-ssl	2m 24s
	3h 21m 37s

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