Avoid creating repeated graph nodes where device matches multiple regexps #1598
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Fixes: #1498
When generating graphviz output, don't output a node which has been output previously.
In fact, if graphviz sees a node with the same name more than once, it will be counted as the same node, so it will only appear once on the graph anyway. But it will appear in an unexpected place if it matches more than one regexp in the same topology map; this change makes it appear in the first row where it matches.