Update CSV classroom input for new Schedules system

(cherry picked from commit 13980d99ed02f7e9902b19cd73d5faa767d33876)
More updates to CSV classroom-input script

(cherry picked from commit 8224cb28cca3204d9adce6d4a4c7a6ba0a09ae6b)
Merge pull request #1495 from learning-unlimited/mit-classroom-import

Update CSV classroom inport for new Schedules system