Display our server host keys for the client to copy and/or validate

We now publish the public key for our embedded SSH server on the
SSH keys settings page, which would be served through HTTPS for
security conscious users.  This way users can install the key on
their known hosts file after logging in, and be reasonably certain
that the daemon they connect to is the daemon assocaited with the
web site they obtained the key through.

Bug: GERRIT-103
Signed-off-by: Shawn O. Pearce <sop@google.com>
10 files changed