Broker should issue QMF event on queue flow control state change
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                 Key: QPID-3080
                 URL: https://issues.apache.org/jira/browse/QPID-3080
             Project: Qpid
          Issue Type: Bug
          Components: C++ Broker
    Affects Versions: 0.9
         Environment: all
            Reporter: Ken Giusti
            Assignee: Ken Giusti
            Priority: Trivial


When a queue's flow control state changes, the broker should issue an QMF event 
to notify management clients.

A rough sketch of a possible schema implementation for the event:

  <eventArguments>
    ....
    <arg name="qName"     type="sstr"   desc="Name of a queue"/>
    <arg name="msgDepth"  type="count32" desc="Current size of queue in 
messages"/>
    <arg name="byteDepth" type="count32" desc="Current size of queue in bytes"/>
    <arg name="active"   type="bool" desc="True if flow stopped, else flow 
allowed"/>
  </eventArguments>

  <event name="queueFlowControl"   sev="inform" args="qName, active, msgDepth, 
byteDepth"/>


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