Actually set up ifcfg correctly in SLE15

xcatroot is actually responsible, not prepivot.sh

xCAT-server/share/xcat/netboot/sle/dracut_033/xcatroot

@@ -292,12 +292,11 @@ function getdevfrommac() {
 
 
 if [ -z $STATEMNT ]; then
-  for lf in /tmp/dhclient.*.lease; do
-    netif=${lf#*.}
-    netif=${netif%.*}
-    cp $lf  "$NEWROOT/var/lib/dhclient/dhclient-$netif.leases"
-    [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "saving $NEWROOT/var/lib/dhclient/dhclient-$netif.leases"
-  done
+  bootif=$(ls /tmp/net.*.conf|sed -e s/.*net\.// -e s/\.conf//)
+  cat <<EOF >  $NEWROOT/etc/sysconfig/network/ifcfg-$bootif
+BOOTPROTO='dhcp'
+STARTMODE='auto'
+EOF
 
   if [ ! -z "$ifname" ]; then
     MACX=${ifname#*:}