[usdMaya] fix bogus name clash errors when stripping namespaces #683
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When exporter strips namespaces is checks if path was already visited and if so raises an error.
However when we also merge transforms and shapes, then it's not an error to map both of them to same primitive.
Description of Change(s)
In addition to checking if path was already visited we check if path is parent or child of visited path.
Fixes Issue(s)
Exporting to usd with namespace stripping and merging transforms and shapes results in error and does not work.