so it can be called from outside Switchman with a specific schema name,
but no Shard instance

Change-Id: I6dd6001adb94f69f0ead93e1f5fea24f906940df
Reviewed-on: https://gerrit.instructure.com/c/switchman/+/320198
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Jacob Burroughs <jburroughs@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>