Add ability to review cert request dialog
    
    The request dialog is not closed directly after clicking 'Issue' button, but only
    after successful issuing or after clicking 'Close' button. So, the user can check
    inputed data.
    
    https://fedorahosted.org/freeipa/ticket/5652
    
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>