refs AE-45
flag=none
test plan:
- specify `canvas_security` values in `vault_contents.yml`
- confirm they're loaded correctly when calling `CanvasSecurity` methods,
like `services_encryption_secret`, `services_signing_secret`, and
`services_previous_signing_secret`
Change-Id: Ib088eb2c123bcc32cfd6d67729916a6d7c5c2529
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/314607
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Isaac Moore <isaac.moore@instructure.com>
Product-Review: Isaac Moore <isaac.moore@instructure.com>
Build-Review: Isaac Moore <isaac.moore@instructure.com>
Reviewed-by: Aaron Ogata <aogata@instructure.com>