Updated openstack/openstack
Project: openstack/python-ceilometerclient  5b4563dd412a61163cadadef542b7635b0355ff0
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Python 3 compatibility

* add Python 3 classifiers
* require at least keystoneclient 0.6.0, since it is the first version that
  works with Python 3.

Change-Id: I631c94d6efa0f7d58ade4a8e044c87558ee58c15