Description of problem:

On receiving from an exchange, the binding is not removed after the subscription is closed. The subscription queue is removed (as expected), but 
the binding remains present and points to a non-existing node. 

This behavior may lead to message loss. When a message is sent to that exchange with the corresponding routing key, the binding takes effect and the message is routed to the non-existing queue.

Please see additional info for more details.

Note: The issue occurs only when using amqp1.0 protocol (the behavior is as expected when using amqp0-10 protocol).

Version-Release number of selected component (if applicable):
qpid-cpp-*-0.22-5

How reproducible:
100%

Steps to Reproduce:
1. drain --connection-options "{protocol:'amqp1.0'}" amq.direct/a
2. qpid-config exchanges -r | grep -A1 amq.direct
(a binding to "<unknown>" queue is listed)
3. spout --connection-options "{protocol:'amqp1.0'}" amq.direct/a
4. use 'qpid-stat -e' to realize that the message was routed to the non-existing queue instead of being dropped

Actual results:
The subscription queue is removed, but the link binding is not removed after the link is closed (i.e. sender/receiver closes). 

Expected results:
link binding is removed after the link is closed.

Additional info:

# $cppapi/drain --connection-options "{protocol:'amqp1.0'}" amq.direct/a
# qpid-stat -e | grep amq.direct
  amq.direct          direct   Y       1     0      0       0        0       0        0
# qpid-config exchanges -r | grep -A1 amq.direct
Exchange 'amq.direct' (direct)
    bind [a] => <unknown>
# $cppapi/spout --connection-options "{protocol:'amqp1.0'}" amq.direct/a
# qpid-stat -e | grep amq.direct
  amq.direct          direct   Y       1     1      1       0        0       0        0
# qpid-tool 
qpid: list binding
Object Summary:
    ID   Created   Destroyed  Index
    ==========================================
<snip>
    107  09:09:06  -          118.139.a
</sip>
qpid: show 107
Object of type: org.apache.qpid.broker:binding:_data(79311b0b-4077-92c0-2001-79e75225daa3)
    Attribute    107
    =====================
    exchangeRef  118
    queueRef     139
    bindingKey   a
    arguments    {}
    origin       absent
    msgMatched   1
qpid: show 139
No object found with ID 139