system-dpdk: Use dummy-pmd port for packet injection. #561

Job	Run time
linux rpm fedora	4m 44s
linux deb no dpdk	4m 54s
dpdk gcc	5s
osx clang --disable-ssl	2m 52s
linux gcc --disable-ssl	2m 11s
linux clang --disable-ssl	2m 59s
linux gcc c99	2m 46s
linux clang c99	2m 10s
linux gcc test	7m 38s
linux clang test asan	13m 34s
linux clang test ubsan	9m 55s
linux gcc test --enable-shared	10m 47s
linux clang test --enable-shared	10m 39s
linux gcc check check-dpdk dpdk	16m 26s
linux clang check check-dpdk dpdk	16m 42s
linux gcc test -ljemalloc	8m 35s
linux clang test -ljemalloc	8m 36s
linux gcc --enable-afxdp	2m 16s
linux clang --enable-afxdp	2m 12s
linux gcc dpdk --enable-shared	2m 55s
linux clang dpdk --enable-shared	3m 3s
linux gcc dpdk-shared	2m 51s
linux clang dpdk-shared	2m 32s
linux gcc dpdk-shared --enable-shared	3m 6s
linux clang dpdk-shared --enable-shared	2m 59s
linux gcc m32 --disable-ssl	2m 15s
linux gcc check-ovsdb-cluster	6m 1s
linux gcc check-kernel -100	8m 50s
linux gcc check-kernel 100-	9m 27s
linux gcc check-offloads -100	8m 31s
linux gcc check-offloads 100-	6m 39s
linux gcc dpdk check-system-userspace	10m 22s
linux gcc dpdk check-system-tso	8m 58s
linux gcc dpdk check-afxdp	10m 50s
	3h 39m 20s

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