Allow operators to customise Nova vendor info

Nova allows customisation of various metadata passed through to VMs via
a 'release' file[0]. Allow operators to make use of this.

[0] https://github.com/openstack/nova/blob/master/etc/nova/release.sample

Change-Id: I71569314c8e64320f8ffad79b9273f4d6d903bb6

ansible/roles/nova/handlers/main.yml

@@ -287,6 +287,7 @@
       or nova_conf.changed | bool
       or policy_overwriting.changed | bool
       or vcenter_ca_file | bool
+      or nova_compute_release_file | bool
       or nova_compute_container.changed | bool
 
 - name: Restart nova-compute-ironic container

ansible/roles/nova/tasks/config.yml

@@ -178,6 +178,25 @@
   notify:
     - Restart nova-compute container
 
+- name: Copying 'release' file for nova_compute
+  vars:
+    service: "{{ nova_services['nova-compute'] }}"
+  copy:
+    src: "{{ item }}"
+    dest: "{{ node_config_directory }}/nova-compute/release"
+  with_first_found:
+    - files:
+        - "{{ node_custom_config }}/nova_compute/{{ inventory_hostname }}/release"
+        - "{{ node_custom_config }}/nova_compute/release"
+        - "{{ node_custom_config }}/nova/release"
+      skip: true
+  register: nova_compute_release_file
+  when:
+    - inventory_hostname in groups[service.group]
+    - service.enabled | bool
+  notify:
+    - Restart nova-compute container
+
 - name: Copying over existing policy file
   become: true
   vars:

ansible/roles/nova/templates/nova-compute.json.j2

@@ -24,7 +24,14 @@
             "dest": "/etc/nova/vmware_ca",
             "owner": "nova",
             "perm": "0600"
-        }{% endif %}
+        }{% endif %},
+        {
+            "source": "{{ container_config_directory }}/release",
+            "dest": "/etc/nova/release",
+            "owner": "nova",
+            "perm": "0600",
+            "optional": true
+        }
     ],
     "permissions": [
         {

releasenotes/notes/config-nova-release-97e6fc526a94740e.yaml

+---
+features:
+  - |
+    You can customise vendor info that is used through out Nova via the
+    'release' file. To do this place a file called 'release' in one of the
+    following locations:
+    /etc/kolla/config/nova/release
+    /etc/kolla/config/nova_compute/release
+    /etc/kolla/config/nova_compute/{{ inventory_hostname }}/release
+
+    An example of the file can be seen at
+    https://github.com/openstack/nova/blob/master/etc/nova/release.sample