rails4: fix activerecord all_models
rails4: fix activerecord all_models

fixes a circular dependency error trying to load
 AccountAuthorizationConfig::CAS

refs #CNVS-21596

Change-Id: I65f92e2cc09228f19363b1964e063a2a5fcde037
Reviewed-on: https://gerrit.instructure.com/57645
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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