Check importing all arch keys
    
    Current builder arch might not be in primary architectures.
    That would not be a problem, presence of archmap record for every key is
    already enforced. Use list of supported arches and just ensure they all
    have working GPG keys. Ensure it is not empty by demanding at least one
    imported key.
    
    Check imported key separately for each release
    
    Stable branch version and rawhide would be different on stable branch.
    Check those releases independent way, each must have own working key.
    
    Signed-off-by: Petr Menšík <pemensik@redhat.com>