don't allow integration specs anymore (use request specs)

Change-Id: I560493461eaaf05941e5ea14c95b094718e13810
Reviewed-on: https://gerrit.instructure.com/29022
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>