Mocking slaplib is good, duplicating all its codebase is wrong.
Should use either a simple mockup, or the real slaplib.

It seems it confuses newcomers for now.

This enables the right acl_user, instead only shadow one.

  setUpOnce is executed on save but afterSetUp is not.

  bootstrapSite should be invoked once per Test Case run instead a single
  time on save phase.

This prevent increasing the memory usage due to huge workflow history.

distribution check: added a few tests

- Raise early
- Also add sanity checks and correct output errors.
- This was outputting bad error message in some cases, making debugging
impossible.