ssh/knownhosts: knownhost to support io.reader

[tg123]

add NewFromReader(reader ...io.Reader) (ssh.HostKeyCallback, error) to knownhosts

fixed #62656

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Boshi Lian:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Boshi Lian:

Patch Set 1:

(1 comment)

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[gopherbot]

This PR (HEAD: db271c4) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/crypto/+/528636.

Important tips:

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