test: Add an update-refs.sh script to update reference images

There are cases where the rendered output of a test can vary from
backend to backend in ways which are visually acceptable.  This is why
we have reference images in the first place.  In these cases, changes to
the rendering logic can result in slight differences in the output that
is also within acceptable visual limits.

We see this in the pixman downscaling tests.  This script is introduced
as a way to more easily update the reference images after a renderer
change.

This script is intended to be expanded to handle updating of references
for other tests as we identify similar issues.  The intent is that this
script then serves as a way to document these exceptional cases.

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>

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