Set TCP_NODELAY programmatically

Additions to SumoTraciConnection to allow contol of the TCP_NODELAY flag on the socket connection to SUMO.

Can now be set programmatically, with default set to <b>true</b>, and still allowing the the use of <code>-Dit.polito.appeal.traci.tcp_nodelay=true</code> at program start.

<code>TcpNoDelayControl.java</code> is just an example based on OpenStepsClose.