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Ensure socat process is correctly terminated after test execution (#161) #76

Job	Run time
macos (aarch64)	33s
windows (aarch64)	2m 18s
ubuntu (x86, g++-multilib)	1m 13s
macos (x86_64)	1m 9s
windows (x86_64)	2m 1s
ubuntu (x86_64, g++-)	33s
ubuntu (armhf, g++-arm-linux-gnueabihf)	25s
ubuntu (aarch64, g++-aarch64-linux-gnu)	47s
ubuntu (riscv64, g++-riscv64-linux-gnu)	25s
ubuntu (ppc64, g++-powerpc64le-linux-gnu)	30s
ubuntu (mingw32, g++-mingw-w64-i686)	37s
ubuntu (mingw64, g++-mingw-w64-x86-64)	41s
ubuntu (mingwaarch64, clang)	53s
	12m 5s

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