Don't sort lists and dicts, as order of items matters

[monkz]

What does this PR do?

What issues does this PR fix or reference?

Previous Behavior

If sort_keys is not set to False, pyyaml reorders the data structure alphabetically. While this might me asthetically pleasing, it interferes (at least) with order of entries for gitfs.

New Behavior

Keeps data in original order