Fixes #3190: The Rudder cron entry is now in cron.d instead of the crontab
Refs #3190: some renaming and clarification for /etc/cron.d/rudder-agent
Merge pull request #42 from jooooooon/ust_3146/dev/3190_use_crond_instead_of_crontab

Ust 3146/dev/3190 use crond instead of crontab