Possible forward compatibility: check for existence of /sbin/logrotate before creating symlink.
Add default crontab file for root.
Add /etc/cron.always, /etc/cron.hourly, /etc/cron.daily, /etc/cron.weekly, /etc/cron.yearly directories; add default crontab for root referencing new /boot/run-directories script. When medic-core provides the logrotate package in its `setup` script, it will drop a script in /etc/cron.daily (which will, in turn, reference a logrotate.conf file that includes the contents of /etc/logrotate.d. Same thing in that case: packages can use their setup script to add a log rotation configuration file to /etc/logrotate.d.