tests/system-traffic: Ensure no name resolution for tcpdump. #2348

Job	Run time
linux rpm fedora	7m 49s
osx clang --disable-ssl	5m 44s
linux deb no dpdk	6m 43s
dpdk gcc	8s
linux gcc --disable-ssl	4m 42s
linux clang --disable-ssl	3m 5s
linux gcc c99	3m 30s
linux clang c99	4m 11s
linux gcc test	13m 25s
linux clang test asan	23m 40s
linux clang test ubsan	14m 43s
linux gcc test --enable-shared	17m 28s
linux clang test --enable-shared	18m 0s
linux gcc test dpdk	11m 5s
linux clang test dpdk	13m 58s
linux gcc test -ljemalloc	11m 3s
linux clang test -ljemalloc	11m 18s
linux gcc --enable-afxdp	3m 28s
linux clang --enable-afxdp	3m 13s
linux gcc dpdk --enable-shared	4m 56s
linux clang dpdk --enable-shared	4m 57s
linux gcc dpdk-shared	3m 46s
linux clang dpdk-shared	4m 22s
linux gcc dpdk-shared --enable-shared	4m 49s
linux clang dpdk-shared --enable-shared	4m 8s
linux gcc m32 --disable-ssl	3m 25s
	3h 27m 36s

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