testing: Download MultiView.png as well

It isn't used, but if it doesn't exist, the test gets the .md5 directory
and cannot find its files.

Change-Id: If8019a3a0ad5b5e239f9d3ea974e8bcab3e4334e
Merge topic 'use-external-data' into next

c4ec8611 testing: Download MultiView.png as well