refactor(dns): extrat dns server #2423

Job	Run time
x86_64-unknown-linux-gnu	9m 27s
i686-unknown-linux-gnu	9m 28s
x86_64-unknown-linux-musl	9m 27s
x86_64-unknown-linux-gnu-static-crt	9m 28s
i686-unknown-linux-gnu-static-crt	9m 27s
aarch64-unknown-linux-gnu	9m 28s
armv7-unknown-linux-gnueabi	9m 28s
armv7-unknown-linux-gnueabihf	9m 27s
aarch64-unknown-linux-musl	9m 28s
armv7-unknown-linux-musleabihf	9m 28s
aarch64-unknown-linux-gnu-static-crt	9m 28s
armv7-unknown-linux-gnueabi-static-crt	9m 28s
x86_64-pc-windows-msvc	1s
i686-pc-windows-msvc	9m 22s
aarch64-pc-windows-msvc	9m 26s
x86_64-pc-windows-msvc-static-crt	1s
i686-pc-windows-msvc-static-crt	9m 22s
aarch64-pc-windows-msvc-static-crt	9m 24s
x86_64-apple-darwin	9m 28s
aarch64-apple-darwin	9m 30s
x86_64-apple-darwin-static-crt	9m 27s
aarch64-apple-darwin-static-crt	9m 30s
Release	1s
Docker Image	1s
	3h 9m 5s

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