LP-2039105: do not duplicate the oauth headers in case of retry #104
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Bugfix for https://bugs.launchpad.net/maas/+bug/2039105.
The bug is that in case of retry, the oauth headers are duplicated in the requests and MAAS nginx reject the request with 400. The fix is actually to use
http.Header.Set
instead ofhttp.Header.Add
in order to set or replace the "Authentication" header.