spec: intermittent thread hang announcement_spec ordering

Change-Id: Ifbcfd85ad19aefce78a952eba4374ced368dfa0f
Reviewed-on: https://gerrit.instructure.com/37062
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>