store certificates issued for user entries as userCertificate;binary
    
    This patch forces the user management CLI command to store certificates as
    userCertificate;binary attribute. The code to retrieve of user information was
    modified to enable outputting of userCertificate;binary attribute to the
    command line.
    
    The modification also fixes https://fedorahosted.org/freeipa/ticket/5173
    
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>