Merge r1650310, r1650320 from trunk.

Add SSLSessionTickets (on|off).

It controls the use of TLS session tickets
(RFC 5077). Default is unchanged (on).

Using session tickets without restarting
the web server with an appropriate frequency
(e.g. daily) compromises perfect forward
secrecy.

As long as we do not have a nice key management
there should be a way to deactivate session
tickets.


Fix copy and paste error in docs of new feature.


Committed by: rjung
Reviewed by: ylavic, rjung, gsmith
Backported by: ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1678703 13f79535-47bb-0310-9956-ffa450edef68