Add AZ to instances and image/server to volumes

This syncs the event definitions and gnocci resources with
what was backported to Queens in downstream.

In order for those to be applied properly, need to set

ceilometer:
  server:
    publisher:
      gnocchi:
        enabled: True
        create_resources: True

in the model for ceilometer (usually on mdb* nodes).

Change-Id: I6e3b04d4a34a29770af6a0e7cfe03d118bdef4c2
Related-Issue: PROD-33784
4 files changed