This reverts commit ef5ebed6c9ca3d9d47fd2a732a1542555a0f65ba.
The problem here is a backwards-incompatible change to
configure_auth_token_middleware. Plugins are still passing a
"signing_dir" which is interpreted now as the "section" argument
... this leads to an interesting red-herring issue; because "v" is a
gnu sed command for checking the version, a signing_dir of "/var/..."
(as done in most plugins) gives the weird error:
sed: -e expression #1, char 32: expected newer version of sed
I think we'll either need a new function, or dummy arguments to get
this back in.
Change-Id: I2098d4eb2747282622cf486fa7dbf216f932f58b
1f82f43016