[Bug 198043] Updated OpenSSH no longer uses FQDN in known_hosts

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198043

            Bug ID: 198043
           Summary: Updated OpenSSH no longer uses FQDN in known_hosts
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eric at vangyzen.net

The update to OpenSSH 6.5p1 (r261320) removed FreeBSD's customization to use
the canonical hostname (FQDN) in the known_hosts file.  Was this intentional? 
Could it be restored?

Conveniently, patch-ssh.c from security/openssh-portable applies cleanly to
releng/10.1 (and to head, I expect).

The new CanonicalizeHostname and related options can be used to get the old
behavior, but only by manually configuring the DNS search path in an ssh client
config file.  It would be unfortunate if this were required in order to
preserve the long-standing behavior.

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