MFC r287920:

MFC r287920:

  Fix /sbin/route to never look up (invalid) interface names through DNS

  /sbin/route has a bug where if it is passed an interface name that does
  not exist, it falls through and winds up interpreting it as a hostname.
  It fails out eventually, but on a system where DNS lookup is broken you
  can end up waiting for up to 60 seconds waiting for the DNS lookup to
  timeout.  I'm not quite sure what happens if the DNS lookup somehow
  succeeds but I doubt that can end well.

  Reviewed by:  markj, cem
  MFC after:    2 weeks
  Sponsored by: EMC/Isilon Storage Division

git-svn-id: svn://svn.freebsd.org/base/stable/10@293208 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f