这里有两个参数
OPEN
NOTFIXED
OPEN用于 消息有group message的情况下，即消息需要放到同一个QMGR里面去，则将queue的DEFBIND定义为OPEN
这种也可以实现负载均衡，不过这个是按照queue来区分的，不是按照消息来实现负载均衡的
DEFBIND(NOTFIXED) with a round-robin distribution of messages to all available TARGET.Qs in the cluster
DEFBIND(OPEN) the destination queue is selected at MQOPEN time and will not be changed until MQCLOSE.
The queue attribute DEFBIND determines whether or not rerouting will be performed while a queue is opened:
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