NetIO: add option `--netio-detect-total` #761

Job	Run time
Linux-aarch64	10m 33s
Linux-amd64	3m 40s
Linux build test (gcc, g++, ON)	55s
FreeBSD-amd64	7m 6s
Linux build test (gcc, g++, OFF)	49s
Linux-old-amd64	3m 25s
Linux build test (clang, clang++, ON)	1m 3s
macOS-universal	13m 56s
Linux build test (clang, clang++, OFF)	1m 7s
spellcheck	13s
Linux build test (musl-gcc, musl-g++, OFF)	44s
Windows-amd64	2m 49s
Windows-i686	6h 0m 12s
Release	0s
	6h 46m 32s

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