Repeated nova deprecation messages in controller's /var/log/messages

Issue

• The following messages are repeated frequently, roughly 20 times in a second:

Mar 17 12:54:34 node nova-conductor: /usr/lib/python2.7/site-packages/amqp/channel.py:616: VDeprecationWarning: The auto_delete flag for exchanges has been deprecated and will be removed 
Mar 17 12:54:34 node nova-conductor: from py-amqp v1.5.0. 
Mar 17 12:54:34 node nova-conductor: warn(VDeprecationWarning(EXCHANGE_AUTODELETE_DEPRECATED))
Mar 17 12:54:34 node nova-conductor: /usr/lib/python2.7/site-packages/amqp/channel.py:616: VDeprecationWarning: The auto_delete flag for exchanges has been deprecated and will be removed 
Mar 17 12:54:34 node nova-conductor: from py-amqp v1.5.0. 
Mar 17 12:54:34 node nova-conductor: warn(VDeprecationWarning(EXCHANGE_AUTODELETE_DEPRECATED))
Mar 17 12:54:34 node nova-conductor: /usr/lib/python2.7/site-packages/amqp/channel.py:616: VDeprecationWarning: The auto_delete flag for exchanges has been deprecated and will be removed 
Mar 17 12:54:34 node nova-conductor: from py-amqp v1.5.0. 
Mar 17 12:54:34 node nova-conductor: warn(VDeprecationWarning(EXCHANGE_AUTODELETE_DEPRECATED))
Mar 17 12:54:34 node nova-conductor: /usr/lib/python2.7/site-packages/amqp/channel.py:616: VDeprecationWarning: The auto_delete flag for exchanges has been deprecated and will be removed 
Mar 17 12:54:34 node nova-conductor: from py-amqp v1.5.0. 
Mar 17 12:54:34 node nova-conductor: warn(VDeprecationWarning(EXCHANGE_AUTODELETE_DEPRECATED))

• These messages fill up the log and make it difficult to read.