Timeout quikly when disconnecting existing slave

If a slave that is already connected attempts connecting the existing
connection for that slave is disconnected.  The most common scenario for
this is that the existing connection is stale and the slave is
attempting to connect agan.  However if the connection is stale then the
disconnection will take 15 minutes to time out and the slave will appear
unresponsive during this time.  Fix this problem by setting the timeout
to 15 seconds before disconnecting the existing connection.

master.js

@@ -1006,6 +1006,7 @@ async function handleHandshake(message, socket, req, attachHandler) {
 		let connection = slaveConnections.get(data.id);
 		if (connection) {
 			console.log(`SOCKET | disconnecting existing connection for slave ${data.id}`);
+			connection.connector.setTimeout(15); // Slave connection is likely stalled
 			await connection.disconnect(1008, "Registered from another connection");
 		}