c3444c1 add "--quiet" option

Authored and Committed by Michal Srb 3 years ago
    add "--quiet" option
    
    Only error messages will be shown when this option is used. As a result,
    all "pre-existing problem" messages will be suppressed.
    
    Signed-off-by: Michal Srb <michal@redhat.com>
    
        
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