Ticket 49748 - Passthru plugin startTLS option not working
    
    Description:  While you can configure a connection to use StartTLS the
                  plugin code did not attempt to use StartTLS.
    
    https://pagure.io/389-ds-base/issue/49748
    
    Reviewed by: tbordaz & lkrispenz(Thanks!!)
    
    (cherry picked from commit d870eb0d410b59b2624e0aabe5dbeeb0afe94235)