x/crypto/ssh: add function to parse known_hosts files.

Change-Id: I9258ecf2b38258e31bcb6e73ac042ad8125fd2d1
Reviewed-on: https://go-review.googlesource.com/18106
Reviewed-by: Peter Moody <peter.moody@gmail.com>
Reviewed-by: Adam Langley <agl@golang.org>
2 files changed