Determistically enter classes from directory into package scope

On Linux, the directory listing is not automatically sorted on Mac.
This leads to non-determistic ids of Symbols of the classes in a
directory, which in turn leads to instability of the ordering of
parents within inferred refinement types.

Notable, with this patch, we will stably infer:

```
scala> case class C(); case class D(); List(C(), D()).head
defined class C
defined class D
res0: Product with Serializable = C()
```

rather than sometimes getting `Serializable with Product` on
Linux. As such, I've removed the workarounds for this instability
in two test cases.

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