* Move dep/ to internal/
* Move testdata/ to internal/testdata
* Move log funcs into own internal package so test, internal and cmd/dep can reference.
  Otherwise circular references were present.
  Using the name util in honor of @kris-nova and to ensure proper bike-shedding.
* Move test/ into internal/test/ so that internal tests can use it

This lets other packages reference the configuration files

There’s an awkward cycle between util and test. One way to resolve would be to bring test into util.
For now, I kept fs_test in internal instead of moving it into util too.

Moving internal/* to internal/dep/*. This keeps all our old references the same as before
e.g. dep.Ctx stays the same instead of internal.Ctx