Description of problem:

if a dbadmin won't configure remote db correctly engine-setup would fail with:

~~~
...
[ INFO  ] Stage: Misc configuration
         
          PostgreSQL uuid-ossp extension is not installed in  the engine :database
          Please run the following commands from psql prompt  with database administrator privileges and run  engine-setup again:
          DROP FUNCTION IF EXISTS uuid_generate_v1();
          CREATE EXTENSION "uuid-ossp";
          For DROP you should connect to the engine database,
            even though you use admin user.
[ ERROR ] Failed to execute stage 'Misc configuration': uuid-ossp extension is not installed on database
[ INFO  ] Yum Performing yum transaction rollback
[ INFO  ] Stage: Clean up
          Log file is located at /var/log/ovirt-engine/setup/ovirt-engine-setup-20180124181741-012jha.log
[ INFO  ] Generating answer file '/var/lib/ovirt-engine/setup/answers/20180124181849-setup.conf'
[ INFO  ] Stage: Pre-termination
[ INFO  ] Stage: Termination
[ ERROR ] Execution of setup failed
~~~

this is caused with https://bugzilla.redhat.com/show_bug.cgi?id=1515635


Version-Release number of selected component (if applicable):
4.2

How reproducible:
100%

Steps to Reproduce:
1. follow 4.2-beta for remote db
2. engine-setup
3.

Actual results:
fails

Expected results:
docs should have info about uuid-ossp configuration

Additional info: