[syslinux-iso] Allow to execute a script at boot specified with the kernel boot parameters

Changed to work with recent cmdline_param() -> kernel_cmdline() change. (Gerardo)
Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

configs/syslinux-iso/overlay/etc/functions.d/automated_script

+automated_script ()
+{
+    script="$(kernel_cmdline script)"
+    if [ -n $script ] ; then
+        stat_busy "Configuring $script"
+        if [[ $script =~ ^http:// || $script =~ ^ftp:// ]] ; then
+            wget "$script" -q -O /tmp/startup_script >/dev/null
+            rt=$?
+        else
+            cp $script /tmp/startup_script
+            rt=$?
+        fi
+        if [ $rt -eq 0 ] ; then
+            chmod +x /tmp/startup_script
+            echo -e "\nif [ \`tty\` = \"/dev/tty1\" ] ; then\n    /tmp/startup_script\nfi\n" >> /root/.bash_profile
+            stat_done
+        else
+            stat_fail
+        fi
+    fi
+}
+
+add_hook multi_end automated_script