Fetch test data only when BUILD_TESTING is ON
Fetch test data only when BUILD_TESTING is ON

Change-Id: I654bcbf70e1e38a502fe19cb7c551d2acc2a2ba3

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