[Java broker] enable configuring the default reply to an unsupported protocol 
version initiation
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                 Key: QPID-3813
                 URL: https://issues.apache.org/jira/browse/QPID-3813
             Project: Qpid
          Issue Type: Improvement
          Components: Java Broker
            Reporter: Robbie Gemmell
            Assignee: Robbie Gemmell
            Priority: Minor
             Fix For: 0.15


The Java broker supports multiple version of the AMQP protocol 
(0-8,0-9,0-9-1,0-10), and allows disabling specific versions on specific (or 
all) ports. It would be useful if the default version reply to an unsupported 
protocol version initiation attempt could be configured, to allow controlling 
behaviour of the broker in this situation.

For example, a broker could have 0-8, 0-9, 0-9-1 enabled on one port and 0-10 
enabled on another. In this state, a legacy client supporting 0-9 and 0-10 but 
not 0-9-1 would be unable to connect to the first port because the broker will 
reply with 0-9-1 if the client initially attempts 0-10. If the broker could be 
configured to reply with 0-9 instead in this case the legacy client would then 
be able to connect, and any newer clients could still connect on this port if 
simply using 0-9-1 directly.

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