I have worked hard to reduce diffs against the vendor branch. One
notable change in that respect is that we no longer prefer DSA over
RSA - the reasons for doing so went away years ago. This may cause
some surprises, as ssh will warn about unknown host keys even for
hosts whose keys haven't changed.
MFC after: 6 weeks
The section about our local changes needs reviewing, and some of those
changes should probably be reconsidered (such as preferring DSA over RSA,
which made sense when RSA was encumbered but probably doesn't any more)
