Avoid building base instead use base img as src img

This will save time during image build. If you need base image build it
separtely and use the new image as src for build.

openstack-compute/nodeimage.pkr.hcl

@@ -36,17 +36,6 @@ source "openstack" "image" {
 build {
   sources = ["source.openstack.image"]
 
-  provisioner "ansible" {
-    use_proxy     = false
-    user          = var.ssh_username
-    groups        = ["base"]
-    playbook_file = "./ansible/base.yml"
-    roles_path    = "./ansible/roles"
-    extra_arguments = [
-      "--extra-vars", "root_ssh_key='${var.root_ssh_key}'"
-    ]
-  }
-  
   provisioner "ansible" {
     use_proxy     = false
     user          = var.ssh_username