Use set_up_once_called conflicts with setUpOnce call

  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.
Merge branch 'cliff'
Fix duplicated definition of IExtrator

This enables the right acl_user, instead only shadow one.
Included recently added slapos_access_token_extration plugin
A new module has been installed.
Instance bang now returns "OK"
Return response object.
Missing base category on portal type.
Open Order line start/stop date have the same timezone.
Include more tests for check configuration and promises on a configured site.
Only prevent successive direct bang calls.
Re-enable the alarm disabled by mistake.
Do not allow to rename from the web site.

It seems it confuses newcomers for now.