cef8650 gather: Report missing comps packages

Authored and Committed by lsedlar 6 years ago
    gather: Report missing comps packages
    
    When a package mentioned in comps is not available in the package set,
    print a warning about this. Additionally there is a config option that
    allows to turn this warning into a fatal error.
    
    Fixes: https://pagure.io/pungi/issue/50
    Fixes: https://pagure.io/pungi/issue/683
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
    
        
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