images: change cloud-init data source to nocloud

Switch cloud-init data source from nocloud-net to nocloud, since
noncloud-net is now marked as deprecated and same functionality is
provided by nocloud.

images/base.pkr.hcl

@@ -36,7 +36,7 @@ source "qemu" "autogenerated_1" {
   memory           = "${var.memory}"
   net_device       = "virtio-net"
   output_directory = "output-${var.outname}"
-  qemuargs         = [["-smbios", "type=1,serial=ds=nocloud-net;instance-id=packer;seedfrom=http://{{ .HTTPIP }}:{{ .HTTPPort }}/"],
+  qemuargs         = [["-smbios", "type=1,serial=ds=nocloud;instance-id=packer;seedfrom=http://{{ .HTTPIP }}:{{ .HTTPPort }}/"],
                       ["-machine", "pc-q35-4.2,accel=kvm:tcg,usb=off,vmport=off,dump-guest-core=off"]]
   shutdown_command = "sudo shutdown --poweroff --no-wall now"
   ssh_password     = "ubuntu"