Updated openstack/openstack
Project: openstack/swift  901bd044c38e7aa1ff2b79d3790ea27f9990b1c8
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Remove obsolete future imports

The with statement has been standard since Python 2.5, so we can get
rid of these imports.

Change-Id: I280971c3d8c01e94cc2c17cacaedcbe9d9c8a3c3