Updated openstack/openstack
Project: openstack/python-ceilometerclient  fcfffacd3b13ca295a7f2ba42176f4212c1c96fb
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Implementation of statistics aggregators

This corresponds to do API calls on:
/v2/meters/meter-name/statistics?aggregate.func=func-name

Usage:
aggregates = [{'func': 'cardinality', 'param': 'resource_id'}])
client.statistics.list(meter_name="instance", aggregates=aggregates)

CLI:
ceilometer statistics -m instance -a "cardinality<-resource_id"

Change-Id: I0096668585a5c7e7985973f07049eb91f44413fe