tests, postgresql: add ubuntu 16.04 support

(cherry picked from commit 5583027f99)

test/integration/roles/setup_postgresql_db/vars/Ubuntu-16.yml

@@ -0,0 +1,10 @@
+postgresql_service: "postgresql"
+
+postgresql_packages:
+  - "postgresql"
+  - "postgresql-common"
+  - "python-psycopg2"
+
+pg_hba_location: "/etc/postgresql/9.5/main/pg_hba.conf"
+pg_dir: "/var/lib/postgresql/9.5/main"
+pg_ver: 9.5