Updated openstack/openstack
Project: openstack/python-swiftclient  7dcefe1b6422b418d1a3746e03fe36d8855f32c7
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Python 3: Replace iter.next() with six.next(iter)

Use six.next() to be Python 3 compatible.

Change-Id: Ia16148a759d368872787d5896a7b1dc42ffcdfb5