0a90965 Fix linting issues

Authored and Committed by zlopez 10 months ago
    Fix linting issues
    
    This fixes all the issues that were found by `make lint` and `make flake8`
    tests. The make was run inside vagrant dev environment.
    
    Introduces new dependency `filetype`, because `imghdr` module is deprecated in
    python >= 3.
    
    Signed-off-by: Michal Konečný <mkonecny@redhat.com>
    
        
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