Some changes are required so that ceilometer can gather usage data
from glance (notification & polling) out-of-the-box in devstack:
- configure glance to emit notifications if rabbitmq or qpid
is enabled
- configure the ceilometer collector to consume notifications
on the default glance topic (glance_notifications.*)
- pass credentials to ceilometer central agent so that it
authtenticate polling calls to glance
Change-Id: I0eac223eddb615266e28447b18fcaaadcd40dddf
ad80eadb08