verrel command on master asks Koji first
    
    `fedpkg verrel` on master branch could return wrong result in some
    cases. Now running order is: asks active Koji session, asks anonymous
    Koji session and then if there is still no result, tries to determine
    release offline. Fedpkg ability to work offline is still desirable.
    
    JIRA: COMPOSE-3876
    Fixes: #357
    
    Signed-off-by: Ondrej Nosek <onosek@redhat.com>