update lib/utils.sh

- add 'is_pkg_a_dependency', to ensure a package is not needed by some others before removing it
-> will be used in debian 12 CIS by at least the 2.1.5 recommendation

- update 'is_service_enabled' to use 'systemd' instead of 'rc.d', as we are now only supporting debian LTS using systemd
- add 'is_using_sbin_init' to ensure we can use systemctl, in case of running on non detected container
- add 'manage_service' to enable / disable service using systemctl

chore: update script related to systemctl / service

- configure_systemd-timesync.sh:        use "is_service_enabled" instead of calling systemctl
- disable_automounting.sh:              use "manage_service" instead of "update-rc.d"
- enable_auditd.sh:                     use "manage_service" instead of "update-rc.d"
- enable_cron.sh:                       use "manage_service" instead of "update-rc.d"
- enable_syslog-ng.sh:                  use "manage_service" instead of "update-rc.d"

lib/utils.sh

@@ -593,8 +593,6 @@ is_pkg_installed() {
 is_pkg_a_dependency() {
     # check if package is needed by another installed package
     local PKG_NAME=$1
-    # ex: 'dnsmasq' is going to install 'dnsmasq-base'
-    # so we don't care about 'dnsmasq-base', we want to know about others packages
     shift
     local known_deps="$*"
 
@@ -672,5 +670,4 @@ manage_service() {
     fi
 
     systemctl "$action" "$service" >/dev/null 2>&1
-
 }