DB2 client: avoid System.out logging

Author: Sanne

vertx-db2-client/src/main/java/io/vertx/db2client/impl/codec/InitialHandshakeCommandCodec.java

@@ -115,7 +115,6 @@ void decodePayload(ByteBuf payload, int payloadLength) {
         connectRequest.completeCommand();
 
         int lenOfPayload = packet.writerIndex() - packetStartIdx;
-        System.out.println("packet length: " + lenOfPayload);
         sendPacket(packet, lenOfPayload);
         status = ConnectionState.AUTHENTICATING;
         break;