instructorFeedbackResults: instructor should see normalized contribution values #2530

Show normalized values to instructor, now the perceived contribution is the average of the normalized contribution given by others. For contribution value given to self, the claimed/actual value is used since this is not normalized/available.

Also moved the photo related tests in InstructorFeedbackResultsPageUiTest that are failing, to the bottom of the tests to let other tests run.

Fixes #2530