Fix gerrit_builder checkout
Fix gerrit_builder checkout

Closes: GRADE-2072

Test Plan:
- quiz_lti e2e specs can be ran because the config 
  files (like database.yml) are in the right location

Change-Id: I9e8736f8187be989de5955ecd181afd9360fa4c8
Reviewed-on: https://gerrit.instructure.com/185212
Reviewed-by: Robert Lamb <bf934bf7cdbebe5899399a138c0cb75c4d783999@instructure.com>
QA-Review: Robert Lamb <bf934bf7cdbebe5899399a138c0cb75c4d783999@instructure.com>
Product-Review: Robert Lamb <bf934bf7cdbebe5899399a138c0cb75c4d783999@instructure.com>
Tested-by: Jenkins

sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms