Fixed the ordering of images for regression testing

[aashish24]

So that the cdash will show them correctly in the right
order

@jbeezley @doutriaux1 @ThomasMaxwell please review

[doutriaux1]

Thanks!

[jbeezley]

That caused the error to go away completely when it should have just switched the images in cdash. This line makes me very suspicious. I think an IOError is raised in the try block somewhere causing the test to return successfully when it should actually fail. If there really is a reason to do this, the condition should probably be more narrowly defined.

[doutriaux1]

what are you saying @jbeezley ? You don't like "magic"?
More seriously should we worry about this now, or open a new issue for 2.3? I'll leave it up to you.

[jbeezley]

I would say leave it for 2.3 and go over all of the tests to make sure failures are reported correctly (as in #1015).

[aashish24]

@jbeezley agree with you. it should have ret = (anything but 0). I will push a branch post 2.2 release.