Remove non-sensical kdestroy on https stop
    
    This kdestroy runs as root and wipes root's own ccachs ...
    this is totally inappropriate.
    Use a file ccache that ends up in the private tmp, so that if the
    service is restarted the file is automatically removed.
    
    https://fedorahosted.org/freeipa/ticket/6673
    
    Signed-off-by: Simo Sorce <simo@redhat.com>
    Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>