Add support for RFC 5077 TLS Session tickets. This adds two new directives:

* SSLTicketKeyFile: To store the private information for the encryption of the ticket.
* SSLTicketKeyDefault To set the default, otherwise the first listed token is used.  This enables key rotation across servers.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1200040 13f79535-47bb-0310-9956-ffa450edef68