Reactivate the RenderingImage tests.
Reactivate the RenderingImage tests.

These tests have been inactive since they were moved into this
directory in June.

Change-Id: Ibb11f953b48ffc1ab23ca7f6b15343e89339a21b

johnkit/vtk-dev,mspark93/VTK,sankhesh/VTK,sumedhasingla/VTK,ashray/VTK-EVM,sumedhasingla/VTK,demarle/VTK,ashray/VTK-EVM,hendradarwin/VTK,sankhesh/VTK,keithroe/vtkoptix,jmerkow/VTK,gram526/VTK,mspark93/VTK,demarle/VTK,sankhesh/VTK,johnkit/vtk-dev,candy7393/VTK,msmolens/VTK,gram526/VTK,jmerkow/VTK,SimVascular/VTK,hendradarwin/VTK,johnkit/vtk-dev,candy7393/VTK,sankhesh/VTK,msmolens/VTK,ashray/VTK-EVM,candy7393/VTK,candy7393/VTK,johnkit/vtk-dev,mspark93/VTK,hendradarwin/VTK,demarle/VTK,demarle/VTK,sankhesh/VTK,demarle/VTK,SimVascular/VTK,sumedhasingla/VTK,keithroe/vtkoptix,jmerkow/VTK,ashray/VTK-EVM,mspark93/VTK,gram526/VTK,mspark93/VTK,msmolens/VTK,gram526/VTK,SimVascular/VTK,candy7393/VTK,sumedhasingla/VTK,msmolens/VTK,sumedhasingla/VTK,candy7393/VTK,jmerkow/VTK,hendradarwin/VTK,mspark93/VTK,SimVascular/VTK,demarle/VTK,demarle/VTK,sumedhasingla/VTK,sumedhasingla/VTK,candy7393/VTK,demarle/VTK,jmerkow/VTK,keithroe/vtkoptix,sankhesh/VTK,sumedhasingla/VTK,hendradarwin/VTK,keithroe/vtkoptix,keithroe/vtkoptix,gram526/VTK,SimVascular/VTK,johnkit/vtk-dev,ashray/VTK-EVM,keithroe/vtkoptix,SimVascular/VTK,msmolens/VTK,msmolens/VTK,ashray/VTK-EVM,SimVascular/VTK,keithroe/vtkoptix,msmolens/VTK,jmerkow/VTK,jmerkow/VTK,gram526/VTK,johnkit/vtk-dev,mspark93/VTK,msmolens/VTK,ashray/VTK-EVM,gram526/VTK,hendradarwin/VTK,candy7393/VTK,keithroe/vtkoptix,johnkit/vtk-dev,ashray/VTK-EVM,hendradarwin/VTK,sankhesh/VTK,SimVascular/VTK,mspark93/VTK,gram526/VTK,jmerkow/VTK,sankhesh/VTK