Sort config files as documented.

[ChrisHines]

Fixes #587.

[diptanu]

LGTM. This is breaking on my local environment too. I wonder why our build was not broken in the CI. Further this test doesn't need to be run as a root as well.

[ChrisHines]

The tests worked for me on Ubuntu with ext4 and on Windows. With only two config files in the test directory it may be a 50% shot that directory order is not alphabetical, or it could be very OS or filesystem dependent. Googling for "linux directory order" produces some interesting reading.

[diptanu]

@ChrisHines Thanks for the explanation, makes sense.

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