The py-psycopg2 package now requires postgresql95-server instead of
postgresql93-server. Installing py-psycopg2 will automatically remove
postgresql93-server if it is installed, breaking integration tests.
* PostgreSQL tests: use package module
* PostgreSQL tests: use ansible_service_mgr in order to test init system
* PostgreSQL tests: fix a typo
* PostgreSQL tests: install only required packages
* PostgreSQL tests: use role default value when unchanged
* Use vars for user, group and locale suffix.
* Switch tests from `es_MX` to `es_ES`.
* Enable postgresql tests on freebsd.
* Work-arounds for service restart on freebsd.
