Add explanation and example for 'Secure Cookie Handshake' to akka-sample-remote

Added some commented out configuration items to provide an example of how to use
the Secure Cookie Handshake feature. Users can simply uncomment to try it out

Added an indication in the application.conf file that the remote.netty.tcp.port is
actually the LISTEN port.
Merge pull request #1625 from worms/master

Add explanation and example for 'Secure Cookie Handshake' to akka-sample...