GafferOSLTest : Fix setUp() methods.
GafferOSLTest : Fix setUp() methods.

appleseedhq/gaffer,chippey/gaffer,lucienfostier/gaffer,hradec/gaffer,andrewkaufman/gaffer,hradec/gaffer,chippey/gaffer,boberfly/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,hradec/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,boberfly/gaffer,ivanimanishi/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,chippey/gaffer,boberfly/gaffer,boberfly/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,hradec/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,hradec/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,chippey/gaffer