Merge pull request #497 from orf/rewrite-pinger #869

Job	Run time
Checks	58s
armv7-linux-androideabi	1m 27s
armv7-unknown-linux-gnueabihf	1m 14s
armv7-unknown-linux-musleabihf	1m 27s
x86_64-unknown-linux-gnu	53s
x86_64-unknown-linux-musl	1m 3s
aarch64-unknown-linux-gnu	1m 8s
aarch64-unknown-linux-musl	1m 17s
aarch64-apple-darwin	1m 26s
x86_64-apple-darwin	1m 15s
x86_64-pc-windows-msvc	3m 14s
Release	0s
	15m 22s

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