tests: Move MFEX tests to dpif-netdev. #1982

Job	Run time
linux rpm fedora	5m 22s
osx clang --disable-ssl	3m 36s
dpdk gcc	9s
linux deb no dpdk	6m 47s
linux gcc --disable-ssl	2m 26s
linux clang --disable-ssl	2m 18s
linux gcc c99	2m 10s
linux clang c99	2m 12s
linux gcc test	8m 8s
linux clang test asan	13m 18s
linux clang test ubsan	9m 30s
linux gcc test --enable-shared	10m 37s
linux clang test --enable-shared	10m 53s
linux gcc check check-dpdk dpdk	16m 29s
linux clang check check-dpdk dpdk	16m 56s
linux gcc test -ljemalloc	8m 22s
linux clang test -ljemalloc	8m 46s
linux gcc --enable-afxdp	2m 7s
linux clang --enable-afxdp	2m 12s
linux gcc dpdk --enable-shared	3m 2s
linux clang dpdk --enable-shared	2m 53s
linux gcc dpdk-shared	2m 27s
linux clang dpdk-shared	2m 17s
linux gcc dpdk-shared --enable-shared	3m 2s
linux clang dpdk-shared --enable-shared	3m 9s
linux gcc m32 --disable-ssl	2m 8s
linux gcc check-ovsdb-cluster	6m 7s
linux gcc check-kernel -100	8m 20s
linux gcc check-kernel 100-	8m 19s
linux gcc check-offloads -100	8m 40s
linux gcc check-offloads 100-	6m 56s
linux gcc dpdk check-system-userspace	10m 26s
linux gcc dpdk check-system-tso	8m 58s
linux gcc dpdk check-afxdp	10m 42s
	3h 39m 44s

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