Merge pull request #149 from jooooooon/bug_3730/fix_class_expression_for_cron_check_on_ubuntu_and_redhat

Fixes #3730: fix class expression for cron check on ubuntu and redhat
Fixes #3731: Use cron.d instead of the crontab to store Rudder cron entry (also in initial promises)
Refs #3731: Use cron.d instead of the crontab to store Rudder cron entry (also in initial promises) - also add the template
Merge pull request #150 from jooooooon/bug_3731/Use_cron_d_instead_of_the_crontab_to_store_Rudder_cron_entry__also_in_initial_promises

Fixes #3731: Use cron.d instead of the crontab to store Rudder cron entr...
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5
Merge branch 'branches/rudder/2.5' into branches/rudder/2.6

Conflicts:
	initial-promises/node-server/common/1.0/process_matching.cf
	techniques/system/common/1.0/process_matching.st