/usr/sbin/locale-gen differs between Debian and Ubuntu. With Debian,
locales must be added to /etc/locale.gen before calling locale-gen
command. With Ubuntu, /etc/locale.gen is updated by
/usr/sbin/locale-gen.
Use the locale-gen module which handles both distributions.
* 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.
