Description of exchange configuration options

Configuration option = Default value	Description
[DEFAULT]
ceilometer_control_exchange = ceilometer	(StrOpt) Exchange name for ceilometer notifications.
cinder_control_exchange = cinder	(StrOpt) Exchange name for Cinder notifications.
glance_control_exchange = glance	(StrOpt) Exchange name for Glance notifications.
heat_control_exchange = heat	(StrOpt) Exchange name for Heat notifications
http_control_exchanges = ['nova', 'glance', 'neutron', 'cinder']	(MultiStrOpt) Exchanges name to listen for notifications.
ironic_exchange = ironic	(StrOpt) Exchange name for Ironic notifications.
keystone_control_exchange = keystone	(StrOpt) Exchange name for Keystone notifications.
neutron_control_exchange = neutron	(StrOpt) Exchange name for Neutron notifications.
nova_control_exchange = nova	(StrOpt) Exchange name for Nova notifications.
sahara_control_exchange = sahara	(StrOpt) Exchange name for Data Processing notifications.
sample_source = openstack	(StrOpt) Source for samples emitted on this instance.
swift_control_exchange = swift	(StrOpt) Exchange name for Swift notifications.
trove_control_exchange = trove	(StrOpt) Exchange name for DBaaS notifications.