We don't need to generate password everywhere

   It were using unexisting values

     This makes it available on renderjs_runner UI

   This prevents portal_ids be duplicated.

    This also changes the raise for a more appropriated Exception

  This fixes up most of inconsistencies related to pylint runs in
  order to clean up and make test pass (mostly)

   This reduces the code duplication reusing API to test alarms

    Those 2 scripts lack unit test

   * Use single API
   * Unify usage of _simulateScript with the mixin

  This script is a copy the one on product/ERP5/bin/bigfile_client_example.py