tests: Use ping timeout instead of deadline. #1915

Job	Run time
osx clang --disable-ssl	3m 44s
linux deb no dpdk	8m 11s
linux rpm fedora	6m 40s
dpdk gcc	7s
linux gcc --disable-ssl	3m 29s
linux clang --disable-ssl	3m 43s
linux gcc c99	3m 53s
linux clang c99	3m 19s
linux gcc test	14m 3s
linux clang test asan	20m 26s
linux clang test ubsan	12m 51s
linux gcc test --enable-shared	14m 58s
linux clang test --enable-shared	15m 23s
linux gcc test dpdk	11m 30s
linux clang test dpdk	13m 2s
linux gcc test -ljemalloc	13m 10s
linux clang test -ljemalloc	10m 32s
linux gcc --enable-afxdp	3m 13s
linux clang --enable-afxdp	4m 11s
linux gcc dpdk --enable-shared	6m 44s
linux clang dpdk --enable-shared	4m 32s
linux gcc dpdk-shared	3m 48s
linux clang dpdk-shared	3m 14s
linux gcc dpdk-shared --enable-shared	6m 24s
linux clang dpdk-shared --enable-shared	4m 55s
linux gcc m32 --disable-ssl	4m 33s
	3h 20m 35s

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