Due to this recent discussion
http://lists.openstack.org/pipermail/openstack-dev/2012-November/003578.html
And the commit message in this change
https://review.openstack.org/#/c/12518/
Change-Id: Icf7ee0475045a3d0a19b8d176162bd7286a39ddc
default=socket.gethostname(),
help='Name of the engine node. This can be an opaque identifier.'
'It is not necessarily a hostname, FQDN, or IP address.'),
+cfg.StrOpt('control_exchange',
+ default='heat',
+ help='AMQP exchange to connect to if using RabbitMQ or Qpid'),
cfg.StrOpt('engine_topic',
default='engine',
help='the topic engine nodes listen on')