Add cron for anacron
Add cron for anacron

I thought that anacron installed cron when I tested manually, but
apparently it does not because cron is only recommended and not
required. We explicitly disable installation of recommended packages to
keep total install size down.

Change-Id: I4aef80ed767d978c172dfa3b6cf39ff88bb0d0f8

wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant