Comment 8 for bug 1491908

I think now that container sync doesn't require the 202 we can consider deprecating compatibility with old container sync agents and returning the 409 directly as the error it is

https://github.com/openstack/swift/blob/a30351bdfc60f827979c5afe76ad40bf3a2b05c3/swift/proxy/controllers/obj.py#L482

We should *not* revert the behavior that allowed the proxy to place the object on handoff nodes and return 201 - we should just return the 409 from the object servers that already have the same ts or newer and know that new-ish container-sync will be fine with that (it will right?).