Description of problem:
It is currently possible to specify username "user" as a read only user during "rhevm-dwh-setup" step. It may also be accepted in other places. This results in an incorrect SQL query which results in a failed install.

Version-Release number of selected component (if applicable):
3.3.2

How reproducible:
Always

Steps to Reproduce:
1. install rhev and reports-setup
2. start rhevm-dwh-setup
3. use "user" in this step:

This utility can configure a read only user for DB access. Would you like to do so? (yes|no): yes
Provide a username for read-only user: user

Actual results:
username is accepted, setup fails

Expected results:
username is rejected

Additional info:

resulting SQL query which fails:

engine=# CREATE ROLE user with  login encrypted password 'test';
ERROR:  syntax error at or near "user"
LINE 1: CREATE ROLE user with  login encrypted password 'test';
                    ^
sample of different username which works:

engine=# CREATE ROLE user123123 with  login encrypted password 'test';
CREATE ROLE

Other SQL words which may also need blacklisting (I tested "with" and it also fails)