Adding /etc/rc.d/init.d/functions to the init script when present to … (

elastic#22985) (elastic#75111)

* Adding /etc/rc.d/init.d/functions to the init script when present to improve integration with systemd on systemd-based distros. See elastic#22255

* Adding SysV Init Functions for Debian and SUSE distros

* Adding /etc/rc.d/init.d/functions to the init script when present to improve integration with systemd on systemd-based distros. See elastic#22255

* Adding SysV Init Functions for Debian and SUSE distros

* docs(NA): include a comment to explain the change

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
Co-authored-by: Tiago Costa <tiagoffcc@hotmail.com>

Co-authored-by: Aaron Levy <aaronmaxlevy@gmail.com>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

src/dev/build/tasks/os_packages/service_templates/sysv/etc/init.d/kibana

@@ -15,6 +15,24 @@
 # Description:       Kibana
 ### END INIT INFO
 
+#
+# Source function libraries if present.
+# (It improves integration with systemd)
+#
+# Red Hat
+if [ -f /etc/rc.d/init.d/functions ]; then
+    . /etc/rc.d/init.d/functions
+
+# Debian
+elif [ -f /lib/lsb/init-functions ]; then
+    . /lib/lsb/init-functions
+
+# SUSE
+elif [ -f /etc/rc.status ]; then
+    . /etc/rc.status
+    rc_reset
+fi
+
 name=kibana
 program=/usr/share/kibana/bin/kibana
 pidfile="/var/run/kibana/$name.pid"