When ovirt-engine-provisiondb, a utility usually called by engine-backup, was passed one of the '--provision*db' options to create postgresql DBs/users, the password of the created user is stored in the log file in plain text.
Acknowledgments: Name: Yedidyah Bar David (Red Hat)
Fix included in: https://gerrit.ovirt.org/#/q/I40c88ad48f8f7c2b8e06802137870b0c198b5129
This issue has been addressed in the following products: RHEV Engine version 4.0 Via RHSA-2016:1967 https://rhn.redhat.com/errata/RHSA-2016-1967.html