Debian Templates: anacron should not start in TemplateBasedVMs by default

[adrelanos]

anacron currently starts in TemplateBasedVMs (once installed using apt-get install anaron and perhaps also if part of a dependency). sudo service anacron status -> anacron is running and announcing to run /etc/cron[...]. It should not for the same reasons as cron is not started in Qubes TemplateBasedVMs as decided in #909.

apt-file list anacron

Relevant excerpt.

anacron: /etc/init.d/anacron
anacron: /etc/init/anacron.conf

anacron: /lib/systemd/system/anacron-resume.service
anacron: /lib/systemd/system/anacron.service

anacron: /usr/lib/pm-utils/power.d/anacron
anacron: /usr/lib/pm-utils/sleep.d/95anacron

(This issue was been confirmed by @marmarek in #909 (comment).)