Mehdi Abaakouk 4dd644ac20 batch notification listener
Gnocchi performs better if measurements are write in batch
When Ceilometer is used with Gnocchi, this is not possible.

This change introduce a new notification listener that allows that.

On the driver side, a default batch implementation is provided.
It's just call the legacy poll method many times.

Driver can override it to provide a better implementation.
For example, kafka handles batch natively and take benefit of this.

Change-Id: I16184da24b8661aff7f4fba6196ecf33165f1a77
2015-12-08 09:14:20 +01:00
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