Updated openstack/openstack
Project: openstack/neutron  17b2cf34763654a00c0180f67339b5f22a055f29
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Revert "Hide ipv6 subnet API attributes"

This reverts commit d739486a3f70cb83f8730cf7201a8b8ccf4b4c70.

Change-Id: I27352ba5442da8c69c2d1ab6d5e333e95dc5ebf7