Fixes #3995 - Add backup of /etc/{init.d,default,cron.d}/rudder-agent in preinst and restore action in check-rudder-agent cron file
Merge pull request #136 from nperron/bug_3995/int/prevent_from_removing_init_default_and_cron_file_of_rudder_agent

Fixes #3995 - Add backup of /etc/{init.d,default,cron.d}/rudder-agent in preinst and restore action in check-rudder-agent cron file