We need to parse additional headers earlier, before stdlib tries to
establish message framing.
Now, TestReconstructorRebuildUTF8 can pass on py3.
Closes-Bug: #2097030
Co-Authored-By: Alistair Coles <alistairncoles@gmail.com>
Related-Change: https://review.opendev.org/c/openstack/swift/+/662546
Change-Id: I6aa16fda9285c9fc3816da6fbff2615bd14a020c