auth_token_info is a common field that subclasses of RequestContext
add. It contains things like the token itself and the entire catalog,
both of which are undesirable to log. The token is a security concern
and the catalog is huge, which bloats the logs an unacceptable amount.
This change removes the auth_token_info key from the logging dict
that we return to the log formatter, which eliminates both problems.
(cherry picked from commit 1dd72d1d209e699efc360ff99a20166aac831939)
(cherry picked from commit ab17aef5735bcb242889f610d2165d46b380f7cc)