Updated openstack/openstack
Project: openstack/ceilometer  800395fff85988c5e7d97f8a583ffe056798a824
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transformer: Add aggregator transformer

This adds a transformer aggregate counters until a threshold and/or a
retention time and then flushing them out.

Change-Id: If4a950e585fe5309ddec58ed2c9a92928ac1acb2
Co-Authored-By: Jordan Pittier <jordan.pittier@cloudwatt.com>