Give ownership of info files to ReelWriters (#2912).v2.18.2

The motivation here is to stop a pattern where we create a file, close
it, and then re-open it (many times) as I think there are problems on
Windows when a virus scanner sees the new file, opens it for checking,
and then we can't re-open it.

This also makes things a fair bit simpler, as a lock is removed and we
don't try to differentiate read/write cases by opening the file in
different ways; it's now always writeable.

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