tests: Use ping timeout instead of deadline. #1918

Job	Run time
osx clang --disable-ssl	3m 51s
linux gcc --disable-ssl	4m 3s
linux clang --disable-ssl	4m 19s
linux gcc c99	4m 11s
linux clang c99	3m 42s
linux gcc test 3.16	12m 41s
linux clang test 3.16 asan	18m 47s
linux gcc test --enable-shared	16m 54s
linux clang test --enable-shared	13m 56s
linux gcc test dpdk	10m 38s
linux clang test dpdk	12m 16s
linux gcc test -ljemalloc	10m 14s
linux clang test -ljemalloc	11m 54s
linux gcc 5.8 5.5 5.4 4.19	9m 1s
linux clang 5.8 5.5 5.4 4.19	7m 56s
linux gcc 4.14 4.9 4.4 3.16	8m 21s
linux clang 4.14 4.9 4.4 3.16	7m 47s
linux gcc afxdp 5.3	4m 9s
linux clang afxdp 5.3	5m 0s
linux gcc dpdk --enable-shared	5m 1s
linux clang dpdk --enable-shared	5m 17s
linux gcc dpdk-shared	3m 54s
linux clang dpdk-shared	4m 4s
linux gcc dpdk-shared --enable-shared	6m 23s
linux clang dpdk-shared --enable-shared	5m 35s
linux gcc m32 --disable-ssl	3m 10s
linux gcc deb	9m 28s
	3h 32m 32s

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