Bug 1054326: Initial attempt to submit Imagecompare test framework and test cases int...

...o the main branch
maybe I understand this usage incorrectly.  Don't I still need the destination variable name even if I default to reference_images_path?  Right now I set it to:
 group.add_option('--reference-image-path',
                              dest='ref_path',
                              default="reference_images",
                              help='Location of reference images, relative to the current location')