Robustness on tests

Few tests are often failing.

This MR:

• Retries some test using random data
• Log a bit more informations in tests
• Change some names in tests
• Rename CI into DB_POLICY in order to have more flexibility during the DB setup
  • DB_POLICY=CREATE drop and create the tables
  • DB_POLICY=INSERT insert the default data into the tables
  • DB_POLICY=CREATE,INSERT drop, create, and insert default data (the default behaviour)
  • DB_POLICY= do nothing, trust the actual content of the database