Ceilometer creates metrics that will never get measures (service not
polled, notification not configured).
This is because we create all metrics during resource creation. That was
done sometimes ago because Gnocchi was not provide metrics creating
during batching process.
But since a while now, we also create metrics (if missing) during the
batch processing.
This change removes the creation of metrics during resource creation.
All metrics with measures got created during the batch call.
This stops to have metric without measures in Gnocchi.
Change-Id: I3f3b805722b11029aefdb76bae93413cb32ecff6
826ba35c6e