Moves Nova v3 API enable config to group
Moves Nova v3 API enable config to group

https://review.openstack.org/#/c/29487/ moves the Nova v3 API
enable flag into its own config group. And renames it to just
"enable". This changeset follows that change. As we do not yet
gate on any Nova V3 API tests we don't need to keep the old setting
around.

Change-Id: If1592cd7b9aad24b6d010870a5fb6bcc60efb8ac

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