ssh-pregen-hostkeys: Add a recipe with pregenerated ssh host keys
Host keys are getting bigger and taking an ever increasing amount of time
to generate. Whilst we do need to test that works, we don't need to test
it in every image. Add a recipe which can be added to images with
pre-generated keys, allowing us to speed up tests on the autobuilder
where it makes sense to.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
c6c7d16437cbd5ccbee1b99a2154c33fdbac9299)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
