Fix load balanced hairpin traffic for fragmented packets. #924

Job	Run time
osx clang --disable-ssl	2m 18s
linux rpm fedora	6m 47s
Prepare container	2m 15s
dpdk gcc	4s
linux gcc --disable-ssl	2m 15s
linux clang --disable-ssl	2m 27s
linux gcc test -300	8m 58s
linux gcc test 301-600	5m 43s
linux gcc test 601- unstable	6m 12s
linux clang test sanitizers -300	11m 43s
linux clang test sanitizers 301-600	8m 15s
linux clang test sanitizers 601- unstable	9m 51s
linux gcc test -ljemalloc -300	9m 26s
linux gcc test -ljemalloc 301-600	5m 55s
linux gcc test -ljemalloc 601- unstable	6m 10s
linux gcc system-test-dpdk dpdk -100	15m 51s
linux gcc system-test-dpdk dpdk 101- unstable	11m 17s
linux gcc system-test-userspace -100	15m 0s
linux gcc system-test-userspace 101- unstable	10m 6s
linux gcc system-test -100	17m 53s
linux gcc system-test 101- unstable	14m 18s
linux clang system-test sanitizers -100	19m 34s
linux clang system-test sanitizers 101- unstable	15m 43s
linux x86 gcc --disable-ssl	2m 21s
	3h 30m 22s

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