This fixes a syntax error and a Python 3 incompatibility, and adds
send-review-reminders to the daily cron script.
Important notes:
- I have not tested to what degree the existing reminders work as they
should, as that's out of scope. It does have tests.
- I can't assess whether the virtualenv activation works in the
production setup, and it may be obsolete as bin/daily also
activates the virtualenv.
- The same Python 3 incompatibility (execfile() no longer exists) seems
to exist in various other scripts.
Commit ready for merge.
- Legacy-Id: 16703
296b126c70