Added ImageReader test case for OIIO error buffer overflows.
Added ImageReader test case for OIIO error buffer overflows.

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