Updated openstack/openstack
Project: openstack/ceilometer  d0462fd6f78b1083204150a0351a3bee950f148b
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Event Storage Layer

This change adds the storage layer interfaces
necessary to implement the Event API. It also
updates the get_events call to allow multiple
trait filters.

implements bp specify-event-api

Change-Id: I7aef4a8fc9b88528479f6c0a9feab2c18945bae3