[JENKINS-42959] Return host algorithms if in known_host and we support them #11
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Currently calling
KnownHosts.getPreferredServerHostkeyAlgorithmOrder(String)
always returns null since the initialpreferredAlgo
variable is set to null and never updated. This prevents this method being any use for identifying preferred algorithms to use for the likes of JENKINS-42959.Probably a good idea to merge #10 first to allow tests to be executed