system-traffic.at: Avoid names veth0/veth1 in SRv6 tests. #2226

Job	Run time
osx clang --disable-ssl	4m 4s
dpdk gcc	6s
linux rpm fedora	6m 26s
linux deb no dpdk	5m 53s
linux gcc --disable-ssl	4m 3s
linux clang --disable-ssl	3m 13s
linux gcc test	11m 57s
linux clang test asan	20m 8s
linux clang test ubsan	13m 16s
linux gcc test --enable-shared	15m 43s
linux clang test --enable-shared	17m 52s
linux gcc test dpdk	12m 57s
linux clang test dpdk	12m 15s
linux gcc test -ljemalloc	14m 4s
linux clang test -ljemalloc	13m 25s
linux gcc --enable-afxdp	4m 19s
linux clang --enable-afxdp	3m 6s
linux gcc dpdk --enable-shared	6m 3s
linux clang dpdk --enable-shared	5m 5s
linux gcc dpdk-shared	3m 45s
linux clang dpdk-shared	4m 1s
linux gcc dpdk-shared --enable-shared	6m 13s
linux clang dpdk-shared --enable-shared	4m 4s
linux gcc m32 --disable-ssl	4m 19s
	3h 16m 17s

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