Previously, versioned_writes assumed that all container servers would
always have the latest Swift code, allowing them to return reversed
listings. This could cause the wrong version of a file to be restored
during rolling upgrades.
Now, versioned_writes will check that the listing returned is actually
reversed. If it isn't, we will revert to getting the full (in-order)
listing of versions and reversing it on the proxy.
Change-Id: Ib53574ff71961592426cb386ef00a75eb5824def
Closes-Bug: 1562083