Author unassigned shaders under the mtl scope #2175
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Changes proposed in this pull request
When we author unassigned shaders to usd, we want them to go under the mtl scope. So we need to apply a similar code to what is already done when shaders are assigned under a material. At the moment we only want to do that for actual arnold shaders, and not the other node types which are expressed as UsdShade
Adding test_2174
Issues fixed in this pull request
Fixes #2174