tests: Use ping timeout instead of deadline. #1917

Job	Run time
osx clang --disable-ssl	3m 35s
linux deb no dpdk	10m 0s
linux gcc --disable-ssl	4m 4s
linux deb shared dpdk	16m 53s
linux clang --disable-ssl	3m 44s
linux gcc c99	3m 45s
linux clang c99	4m 23s
linux gcc test	12m 42s
linux clang test asan	20m 37s
linux clang test ubsan	14m 31s
linux gcc test --enable-shared	17m 30s
linux clang test --enable-shared	16m 59s
linux gcc test dpdk	10m 39s
linux clang test dpdk	12m 52s
linux gcc test -ljemalloc	12m 45s
linux clang test -ljemalloc	11m 23s
linux gcc afxdp 5.3	5m 25s
linux clang afxdp 5.3	4m 8s
linux gcc dpdk --enable-shared	5m 52s
linux clang dpdk --enable-shared	5m 29s
linux gcc dpdk-shared	4m 32s
linux clang dpdk-shared	3m 32s
linux gcc dpdk-shared --enable-shared	5m 3s
linux clang dpdk-shared --enable-shared	4m 39s
linux gcc m32 --disable-ssl	4m 5s
	3h 39m 7s

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