optimize and remove omv4 code

install

@@ -13,7 +13,7 @@
 # https://github.com/armbian/config/blob/master/debian-software
 # https://forum.openmediavault.org/index.php/Thread/25062-Install-OMV5-on-Debian-10-Buster/
 #
-# version: 1.3.8
+# version: 1.4.0
 #
 
 if [[ $(id -u) -ne 0 ]]; then
@@ -222,13 +222,7 @@ if [[ ! "${omvInstall}" == "ii" ]]; then
     exit 2
   fi
 
-  if [ ${version} -gt 4 ]; then
-    omv-confdbadm populate
-  else
-    omv-initsystem
-    omv-mkconf interfaces
-    omv-mkconf issue
-  fi
+  omv-confdbadm populate
 fi
 
 # check if openmediavault is install properly
@@ -384,15 +378,11 @@ omv_set_default "OMV_CPUFREQUTILS_GOVERNOR" "${GOVERNOR}"
 omv_set_default "OMV_CPUFREQUTILS_MINSPEED" "${MIN_SPEED}"
 omv_set_default "OMV_CPUFREQUTILS_MAXSPEED" "${MAX_SPEED}"
 
-if [ ${version} -gt 4 ]; then
-  # update pillar default list - /srv/pillar/omv/default.sls
-  omv-salt stage run prepare
-fi
+# update pillar default list - /srv/pillar/omv/default.sls
+omv-salt stage run prepare
 
 # update config files
-for service in nginx ${phpfpm} samba flashmemory ssh ${ntp} timezone monit rrdcached collectd cpufrequtils apt watchdog; do
-  ${confCmd} ${service}
-done
+${confCmd} nginx ${phpfpm} samba flashmemory ssh ${ntp} timezone monit rrdcached collectd cpufrequtils apt watchdog
 
 # create php directories if they don't exist
 modDir="/var/lib/php/modules"
@@ -472,7 +462,7 @@ if [ -n "${USER}" ] && [ ! "${USER}" = "root" ] && [ ! "${USER}" = "pi" ]; then
 fi
 
 # remove networkmanager and dhcpcd5 then configure networkd
-if [ ${version} -gt 4 ] && [ ${skipNet} -ne 1 ]; then
+if [ ${skipNet} -ne 1 ]; then
 
   if [ "${BOARD}" = "helios64" ]; then
     echo -e '#!/bin/sh\n/usr/sbin/ethtool --offload eth1 rx off tx off' > /usr/lib/networkd-dispatcher/routable.d/10-disable-offloading