DA - students with quiz submissions can see show page

fixes CNVS-15783

test plan:
  - as a teacher make a DA'd quiz
    - as a student with an override and a grade,
      as a student with an override and no grade, and
      as a student without an override with a grade
      - the quiz is on the quiz index and assignment index,
        and the show page is normal
    - as a student without a grade or override, with a submission
      * note the submission grade must be nil (the gradebook is messed
      up so you may have to change it via the API)
      - the quiz is on neither the assignment index or quiz index
      - the quiz show page has a flash message telling you it doesnt count
    - as a student without a grade or override without a submission
      - the quiz is on neither the assignment index or quiz index
      - the quiz show page redirects you to the quizzes index
  - with DA off everything works as usual

Change-Id: I51e1e7efd1543e7bb6b858dfa04d7798a516c7c3
Reviewed-on: https://gerrit.instructure.com/41696
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cameron Sutter <csutter@instructure.com>
QA-Review: Sean Lewis <slewis@instructure.com>
Product-Review: Hilary Scharton <hilary@instructure.com>