refactor(dns): extrat dns server (#632) #2426

Job	Run time
x86_64-unknown-linux-gnu	14m 25s
i686-unknown-linux-gnu	16m 24s
x86_64-unknown-linux-musl	15m 56s
x86_64-unknown-linux-gnu-static-crt	15m 29s
i686-unknown-linux-gnu-static-crt	16m 24s
aarch64-unknown-linux-gnu	17m 1s
armv7-unknown-linux-gnueabi	16m 37s
armv7-unknown-linux-gnueabihf	17m 26s
aarch64-unknown-linux-musl	16m 25s
armv7-unknown-linux-musleabihf	16m 55s
aarch64-unknown-linux-gnu-static-crt	16m 51s
armv7-unknown-linux-gnueabi-static-crt	16m 21s
x86_64-pc-windows-msvc	9m 27s
i686-pc-windows-msvc	10m 17s
aarch64-pc-windows-msvc	13m 17s
x86_64-pc-windows-msvc-static-crt	22m 57s
i686-pc-windows-msvc-static-crt	22m 56s
aarch64-pc-windows-msvc-static-crt	14m 15s
x86_64-apple-darwin	20m 40s
aarch64-apple-darwin	12m 23s
x86_64-apple-darwin-static-crt	19m 22s
aarch64-apple-darwin-static-crt	12m 34s
Docker Image	1s
Release	1s
	5h 54m 24s

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