controller: Properly handle localnet flows in I+P. #3301

Job	Run time
dpdk gcc	8s
osx clang --disable-ssl	1m 49s
Prepare container	2m 6s
linux rpm fedora	6m 39s
linux gcc --disable-ssl	2m 12s
linux clang --disable-ssl	2m 21s
linux gcc test -300	8m 59s
linux gcc test 301-600	5m 34s
linux gcc test 601- unstable	5m 53s
linux clang test sanitizers -300	11m 37s
linux clang test sanitizers 301-600	7m 52s
linux clang test sanitizers 601- unstable	9m 38s
linux gcc test -ljemalloc -300	9m 28s
linux gcc test -ljemalloc 301-600	5m 49s
linux gcc test -ljemalloc 601- unstable	6m 3s
linux gcc system-test-dpdk dpdk -100	16m 18s
linux gcc system-test-dpdk dpdk 101- unstable	11m 1s
linux gcc system-test-userspace -100	14m 50s
linux gcc system-test-userspace 101- unstable	10m 18s
linux gcc system-test -100	17m 41s
linux gcc system-test 101- unstable	14m 12s
linux clang system-test sanitizers -100	19m 23s
linux clang system-test sanitizers 101- unstable	15m 40s
linux x86 gcc --disable-ssl	2m 12s
	3h 27m 43s

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