Fixes a bug with the x-open-expired feature where our magic header
does not get copied when refetching all manifests that causes
404 on HEAD requests with part-number=N query parameter since
the object-server returns an empty response body and the
proxy needs to refetch. The fix also applies to segment GET
requests if the segments have expired.
Change-Id: If0382d433f73cc0333bb4d0319fe1487b7783e4c