Since the change in s3_token_middleware to retrieve the auth info
from keystone directly, now, we don't need to have any tokens provided
by keystone in the request header as X-Auth-Token.
Note that this makes the pipeline ordering change documented in the
related changes mandatory, even when working with a v2 Keystone server.
Change-Id: I7c251a758dfc1fedb3fb61e351de305b431afa79
Related-Change: I21e38884a2aefbb94b76c76deccd815f01db7362
Related-Change: Ic9af387b9192f285f0f486e7171eefb23968007e