USN-6279-1: OpenSSH update

USN-6279-1: OpenSSH update

It was discovered that OpenSSH has an observable discrepancy leading to an
information leak in the algorithm negotiation. This update mitigates the
issue by tweaking the client hostkey preference ordering algorithm to
prefer the default ordering if the user has a key that matches the
best-preference default algorithm.
Source: USN-6279-1: OpenSSH update