Temporarily remove SSL changes from NEWS file

Since the current changes in the SSL handling have
been partially disabled, remove their announcement
in the NEWS file until there is something actually
user-facing happening.
Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

NEWS

@@ -28,11 +28,6 @@ Incompatible/important changes
   as well as the --enable-split-queries configuration option.
 - Orphan volumes errors are demoted to warnings and no longer affect the exit
   code of ``gnt-cluster verify``.
-- RPC security got enhanced by using different client SSL certificates
-  for each node. In this context 'gnt-cluster renew-crypto' got a new
-  option '--renew-node-certificates', which renews the client
-  certificates of all nodes. After a cluster upgrade from pre-2.11, run
-  this to create client certificates and activate this feature.
 
 New features
 ~~~~~~~~~~~~