Create PostgreSQL database openfire

Summary:
Openfire allows to store information in local embedded database
or to an external database. As we now maintain PostgreSQL, the
second choice offers better performance.

Ref T1901

Test Plan: Connect to jdbc:postgresql://172.27.27.8:5432/openfire

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1901

Differential Revision: https://devcentral.nasqueron.org/D3192