inner-836:big packet support

[dcy10000]

Signed-off-by: dcy dcy10000@gmail.com

Reason:
  BUG inner-836
Type:
  BUG
Influences：
   fix xx

[ylinzhu]

src/main/java/com/actiontech/dble/net/mysql/CommandPacket.java
BufferUtil.writeUB3(buffer, MySQLPacket.MAX_PACKET_SIZE);
buffer.put(packetId++);
remain = writeBody(buffer, isFirst, remain);
service.getSession().getShardingService().nextPacketId();
//service.getSession().getShardingService().nextPacketId();
service.writeDirectly(buffer);
isFirst = false;

remove useless code instead of comments

[dcy10000]

src/main/java/com/actiontech/dble/net/mysql/CommandPacket.java
BufferUtil.writeUB3(buffer, MySQLPacket.MAX_PACKET_SIZE);
buffer.put(packetId++);
remain = writeBody(buffer, isFirst, remain);
service.getSession().getShardingService().nextPacketId();
//service.getSession().getShardingService().nextPacketId();
service.writeDirectly(buffer);
isFirst = false;

remove useless code instead of comments

done

[ylinzhu]

ok