Beginning in the Pike release, Nova started sending both versioned
and unversioned notifications. The verioned notification queues do
not have any consumers so this causes some queues to fill up until
either the messages expire or they are flushed. This changes the
nova configuration to only send unversioned (legacy) notifications.
Change-Id: Ibaef9dfd75cf2ce6c20d92746b3cf7b37bac24b9
Related-bug: #1665449
d0c3c808bb