spec: don't share postgres connections between threads if not using transactional fixtures
spec: don't share postgres connections between threads if not using transactional fixtures

Change-Id: I39922763ee1bafc3e9ee38e65a3be915c461e3f6
Reviewed-on: https://gerrit.instructure.com/18862
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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