Lookup hostname so we can use it in error messages.
On some clusters, we can have one or two nodes with broken X servers out of a whole job. We need the hostname so we can inform the admin[s] which nodes are broken. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@14766 18c085ea-50e0-402c-830e-de6fd14e8384
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