Add elements for nodepool-builder

Expose a place for users to start writing custom elements for
nodepool-builder.

Change-Id: I311fbf1c23d16939b91dd94f566dcd4509fc502e
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

config/nodepool/elements/README.rst

@@ -0,0 +1,4 @@
+DIB Elements
+============
+
+Elements used by diskimage-builder for building images with nodepool-builder.

config/nodepool/nodepool.yaml.j2

@@ -1,6 +1,7 @@
 # This file is generated by Ansible
 #  DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
 #
+elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool/images
 
 zookeeper-servers:

playbooks/nodepool-builder.yaml

@@ -70,6 +70,15 @@
       include_role:
         name: openstack.nodepool
 
+    - name: Install nodepool elements directory
+      become: yes
+      copy:
+        dest: /etc/nodepool/
+        group: nodepool
+        mode: preserve
+        owner: nodepool
+        src: "{{ windmill_config_git_dest }}/nodepool/elements"
+
     - name: Setup openstack.logrotate role
       include_role:
         name: openstack.logrotate