ensure that Association#with_each_shard doesn't use loaded results
ensure that Association#with_each_shard doesn't use loaded results

Change-Id: Id36a367ea5f135f87e548c64afe8b0c640b6acfc
Reviewed-on: https://gerrit.instructure.com/31443
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Anthus Williams <9b0bb6d8221e7e7c0d84e929f259a97887b2819e@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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