configure: use setup_system.inc.sh to get machineid for configuration

system_setup/configure.sh

@@ -51,7 +51,7 @@ do_configure() {
     echo "=== System Configuration ==="
     echo "Press Enter to keep the current value, or type a new one."
 
-    source "$CONF_FILE"
+    source "$( dirname "$0" )/setup_system.inc.sh"
     VARS=("TLDOMAIN" "SERVERFQDN_IPA" "DOMAIN" "SERVERFQDN_NC" "IPAVAULTUSE" "IPAVAULTNAME" "DISTCONFIGPATH_SRC" "CLIENTADMINGROUP" )
     for ELE in "${VARS[@]}"
     do
@@ -59,7 +59,7 @@ do_configure() {
             echo ""
             new_ELE=$(prompt_value "${ELE}" "${!ELE}")
             set_conf_var "${ELE}" "${new_ELE}"
-            source "$CONF_FILE"
+            source "$( dirname "$0" )/setup_system.inc.sh"
             REPEAT_TEST=1
             case ${ELE} in
                 "SERVERFQDN_NC") echo "=== Testing: Nextcloud server ==="