Fix OverPermission exception for keystone tests

Extend the roles in `access_token` according to the implementation[0]
of the bp basic-default-roles:
    `admin` implies `member` implies `reader`
Support deprecated rules.

[0] Ie18a269e3d1075d955fe494acaf634a393c6bd7b

Change-Id: I0d0de2a20b03548a7e5dab1ee7af7b72651abcb6
Story: 2004709
Task: 28740
5 files changed