netdev-dpdk: Clear IP packet type when no offload is requested. #2270

Job	Run time
osx clang --disable-ssl	4m 5s
linux deb no dpdk	6m 34s
dpdk gcc	7s
linux rpm fedora	6m 20s
linux gcc --disable-ssl	3m 9s
linux clang --disable-ssl	3m 50s
linux gcc c99	3m 17s
linux clang c99	3m 8s
linux gcc test	12m 22s
linux clang test asan	22m 50s
linux clang test ubsan	11m 37s
linux gcc test --enable-shared	18m 21s
linux clang test --enable-shared	14m 41s
linux gcc test dpdk	10m 40s
linux clang test dpdk	12m 44s
linux gcc test -ljemalloc	13m 8s
linux clang test -ljemalloc	13m 2s
linux gcc --enable-afxdp	3m 26s
linux clang --enable-afxdp	3m 19s
linux gcc dpdk --enable-shared	4m 55s
linux clang dpdk --enable-shared	4m 23s
linux gcc dpdk-shared	3m 30s
linux clang dpdk-shared	3m 58s
linux gcc dpdk-shared --enable-shared	5m 26s
linux clang dpdk-shared --enable-shared	5m 6s
linux gcc m32 --disable-ssl	3m 25s
	3h 17m 23s

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