* Factorize tests related to no_password_change using an include task
* Refactor: deduplicate tasks
* postgresql_user: test 'expires' parameter
* Change 'valid until' even it's the only updated field
* value is changed when another value is provided
* value isn't returned when unset
* Remove unused variable
* psycopg2.extras.DictRow is able to handle comparison
* postgresql_user: simplify helper method
* postgresql_user: define variable just before using it
* Fix comparison between user input and applied configuration
* new test: adding an invalid attribute
* Refactor, add cleaning task
* Check that using same attribute a 2nd time does nothing
* Always try to remove created user
* postgresql_user: fix pep8
By default, client encoding is determined either from the LANG_*/LC_*
environment variables or using encoding of the database.
Containers used in the CI don't define a default locale, then encoding
of default databases was SQL_ASCII.
