spec: quoting spec depends on postgresql

Change-Id: I80aae5323ea184e05e4f83d38c2b1e1936423a38
Reviewed-on: https://gerrit.instructure.com/29262
Reviewed-by: Simon Williams <simon@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>