Updated openstack/openstack
Project: openstack/ceilometer  2746db157002a810d103b4770dcfff9cfaaf9aec

Replace dict.iteritems() with six.iteritems(dict)

This change is needed to make Ceilometer code both Python 2.x and
3.x compatible in some future. Oslo modules are left without
changes in this change, that will be done directly in the
oslo-incubator code.

Partially-Implements: blueprint ceilometer-py33-support
Change-Id: Ic7fe5819f85524bb36f04dec6cad10d4cf2b935d