
python-crontab is GPL'd, so we can't use it. This replaces all related functionality with apscheduler. Notable API changes: Since the APScheduler guarantees single execution environments, we no longer have to provide execution time windows for our plugins. Note, pymysql 0.6.4 seems to have issues with some unicode characters. Change-Id: Ie8b3473ac316c8c661f7ffe1cdf069e7e822f23b