netdev-linux: Do not offload IP checksum. #3047

Job	Run time
linux deb no dpdk	4m 21s
dpdk gcc	9s
osx clang --disable-ssl	1m 29s
linux rpm fedora	4m 22s
clang-analyze	17m 52s
linux gcc --disable-ssl	2m 40s
linux clang --disable-ssl	2m 25s
linux gcc c99	2m 40s
linux clang c99	2m 35s
linux gcc test	8m 14s
linux clang address,undefined test	16m 36s
linux gcc test --enable-shared	11m 43s
linux clang test --enable-shared	11m 12s
linux gcc check check-dpdk dpdk	17m 53s
linux clang check check-dpdk dpdk	18m 38s
linux gcc test -ljemalloc	8m 46s
linux clang test -ljemalloc	8m 46s
linux gcc --enable-afxdp	2m 23s
linux clang --enable-afxdp	3m 11s
linux gcc dpdk --enable-shared	4m 16s
linux clang dpdk --enable-shared	3m 47s
linux gcc dpdk-shared	2m 33s
linux clang dpdk-shared	2m 52s
linux gcc dpdk-shared --enable-shared	3m 20s
linux clang dpdk-shared --enable-shared	3m 22s
linux gcc m32 --disable-ssl	2m 32s
linux gcc check-ovsdb-cluster	6m 26s
linux gcc check-kernel -100	8m 58s
linux gcc check-kernel 100-	9m 3s
linux clang address,undefined check-kernel -100	11m 39s
linux clang address,undefined check-kernel 100-	11m 52s
linux gcc check-offloads -100	9m 22s
linux gcc check-offloads 100-	7m 30s
linux gcc dpdk check-system-userspace	11m 6s
linux clang address,undefined dpdk check-system-userspace	14m 17s
linux gcc dpdk check-system-tso	10m 36s
linux gcc dpdk check-afxdp	10m 35s
	4h 40m 1s

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