Auth token middleware does a bit of a hack where it passes an Adapter in
as a session to the client. This is useful there because we need to know
much more about the authentication information than we do in most
clients.
We should look at fixing this in auth_token middleware, however for now
we shouldn't issue a deprecation warning when a user passes an Adapter
as a session object because this has always been designed to work - just
not something we recommend.
Change-Id: If7ebe59d5908275e607f32244027c8e6f3d1e157
Closes-Bug: #1647230
c5bac3a32c