ArnoldShaderTest : Test metadata in a subprocess
ArnoldShaderTest : Test metadata in a subprocess

Our `__forceArnoldRestart()` gambit doesn't work when `IECoreArnold::UniverseBlock` is configured to support multiple universes, because it doesn't call `AiEnd()` when the UniverseBlock is destroyed.

johnhaddon/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,hradec/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,hradec/gaffer,hradec/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,hradec/gaffer,hradec/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,ImageEngine/gaffer