Force disconnection of TCP connection

[dceejay]

PR - updated - thanks all for the good discussion.

Now

• request node
  msg.reset = true; - resets all connections;.
  msg.reset = "host:port"; - just resets that specified connection.

• Out node in reply mode
  msg.reset = true; and no msg._session.id - resets all clients;
  msg.reset = true; and msg._session.id is set - resets specified client.