rails3 spec fixes for tokens controller

Change-Id: I132adfbd015504e1c3667d03ab7f9953793b770e
Reviewed-on: https://gerrit.instructure.com/29777
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>
QA-Review: Derek DeVries <ddevries@instructure.com>