Audit changes.

peer/control_conn.go

@@ -59,3 +59,7 @@ func (c *udpControlConn) run(ch chan<- PingEvent) {
 		ch <- PingEvent{srcVPNIP: srcIP.Unmap(), ping: ping}
 	}
 }
+
+func (c *udpControlConn) Close() error {
+	return c.conn.Close()
+}