Currently, if the ssh connection fails, we are blind to what the
possible failures are. As a result, attempt to fetch the server
console log to help debug the failure.
This is the continuation of I39ec1fe591d6602a3d494ac79ffa6d2203b5676b
but for the feature/zuulv3 branch. This was done to avoid merge
conflicts on the recent changes to nodepool.yaml layout.
Change-Id: I75ccb6d01956fb6052473f44cce8f097a56dd16a
Signed-off-by: Paul Belanger <pabelanger@redhat.com>