Add a test for vtkImageImport / vtkImageExport

Change-Id: I248b1cfe493c813e1c128555e9c9716efd25eb19
Fix pipeline update issues in vtkImageExport

Change-Id: Ia5d19a9fd9c8bfab354b62ce4ff88c09e6643702
Merge topic 'jds_image_import_export_fix' into master

0f6d7456 Fix pipeline update issues in vtkImageExport
070b804c Add a test for vtkImageImport / vtkImageExport