use NO KEY UPDATE lock on postgres 9.3 for sis progress updates

Change-Id: Idcd3eaffcdac3e11a54ba6f172ce55b4c27b9737
Reviewed-on: https://gerrit.instructure.com/39287
Reviewed-by: Zach Wily <zach@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>