Added knowledge of Plab nodes. The correct ssh port is now given when
appropriate. The node status information now reports SSHD port separately; doesn't report IP port ranges for Plab nodes; does report RPM's for virtual nodes; only reports BIOS version if it's specified in the DB; and, if a control net IP isn't found for a node (the case with virtnodes), it reports the control net IP of the physical node.
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