be more descriptive than cannot determine critical zone

[danh]

Sometimes, particularly when a scribe loses its hostname, the gui produces this message that says "CANNOT DETERMINE CRITICAL ZONE". If we can determine additional information, such as we really don't have a hostname, we should put that out in addition or instead.

And, further, since we are sweeping through the scribes every day, we can check on some regular basis (hourly or daily) as to whether a scribe has a hostname, and, if it does not, try to execute dhclient.