Extend the advice printing code by some useful abstractions
    
    The advise printing code was augmented by methods that simplify
    generating bash snippets that report errors or failed commands.
    
    https://pagure.io/freeipa/issue/6982
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>