If you wanted to look through the databases on the oVirt Engine you will have to edit the following file and add your IP to allow connections:
vi /var/opt/rh/rh-postgresql95/lib/pgsql/data/pg_hba.conf
Then stop and start the Engine VM.
You should now be able to connect to the Engine IP on port 5432 as postgres user if pg_hba.conf trusts your IP
Note: use this for discovery only, I wouldn’t recommend changing settings in the database unless you know exactly what you are doing.