When volume backends were defined in the [DEFAULT] cinder.conf config
section, it did not make sense to have more than one AZ config setting.
Now that we have multibackend and we have deprecated the ability to
configure backends in DEFAULT, we can set AZs per backend section.
This previously required setting up a separate service using a different
cinder.conf to have more than one AZ. But since the vast majority of
backends are separate physical devices, there is no reason to restrict
the control plane service to be on separate nodes to support separate AZ
configurations.
Change-Id: I0d7669718a1d1e03e3dd42d1a19b70ff03342bd7
Implements: bp multibackend-az-support
