* Allow session_role to be set for PostgreSQL
By implementing session_role it becomes possible to run the specific
PostgreSQL commands as a different role.
The usecase that is immediately served by this, is the one that one
ansible playbook can be shared by multiple users, which all have
their
own PostgreSQL login_user. They do not need to share login
credentials,
as they can share the role within the PostgreSQL database.
The following example may give some insight:
$ psql -U jdoe -X -d postgres
postgres=> CREATE DATABASE abc;
ERROR: permission denied to create database
postgres=> set role postgres;
SET
postgres=# CREATE DATABASE abc;
CREATE DATABASE
fixes#43592
* Tests for session_role in PostgreSQL
* Bump version_added for session_role feature
* Remove explicit encrypted parameter from tests
