adds the config_template to tempest

The change modifies the tempest template tasks such that it's now
using the config_template action plugin. This change will make so that
config files can be dynamically updated, by a deployer, at run time,
without requiring the need to modify the in tree templates or defaults.

Partially implements: blueprint tunable-openstack-configuration

Change-Id: I3b664fcec14bf01f9916ced0b8595a57d4873f79

playbooks/roles/os_tempest/defaults/main.yml

@@ -107,3 +107,6 @@ tempest_images:
 
 tempest_enable_instance_password: True
 tempest_pip_instructions: "--isolated"
+
+## Tunable overrides
+tempest_tempest_conf_overrides: {}

playbooks/roles/os_tempest/tasks/tempest_post_install.yml

@@ -78,6 +78,23 @@
     - tempest-image
     - tempest-image-unarchive
 
+- name: Copy tempest config
+  config_template:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    owner: "root"
+    group: "root"
+    mode: "0644"
+    config_overrides: "{{ item.config_overrides }}"
+    config_type: "{{ item.config_type }}"
+  with_items:
+    - src: "tempest.conf.j2"
+      dest: "{{ tempest_git_dest }}/etc/tempest.conf"
+      config_overrides: "{{ tempest_tempest_conf_overrides }}"
+      config_type: "ini"
+  tags:
+    - tempest-config
+
 - name: Generate tempest Config
   template:
     src: "{{ item.src }}"
@@ -86,7 +103,6 @@
     group: "root"
     mode: "{{ item.mode|default('0644') }}"
   with_items:
-    - { src: "tempest.conf.j2", dest: "{{ tempest_git_dest }}/etc/tempest.conf" }
     - { src: openstack_tempest_gate.sh.j2, dest: /opt/openstack_tempest_gate.sh, mode: "0755" }
   tags:
     - tempest-config