Prepare containers with openstack-hosts role

The commit [1] allowed repo management for all
hosts where openstack_hosts is applied, and commit [2] removed
UCA from pip install, which applies to all the hosts,
whether they are containers or not.
We should therefore add UCA to containers back.

[1]: https://review.openstack.org/#/c/515399
[2]: https://review.openstack.org/#/c/515400

Change-Id: I79ff70c438b44753be2a93f004ebbc46de0a963d

test-prepare-containers.yml

@@ -17,6 +17,8 @@
   hosts: localhost
   become: true
   gather_facts: true
+  tasks:
+    - include: "common-tasks/test-set-nodepool-vars.yml"
 
 - include: destroy_containers.yml
   when: destroy_first | default(True) | bool
@@ -27,9 +29,10 @@
   become: True
   gather_facts: False
   any_errors_fatal: true
-  roles:
+  tasks:
-    - role: "lxc_container_create"
+    - name: Create containers
-  post_tasks:
+      include_role:
+        name: "lxc_container_create"
     - name: Wait for container connectivity
       wait_for_connection:
         connect_timeout: "{{ lxc_container_wait_params.connect_timeout | default(omit) }}"
@@ -38,3 +41,18 @@
         timeout: "{{ lxc_container_wait_params.timeout | default(omit) }}"
   vars_files:
     - test-vars.yml
+
+# TODO(evrardjp): Move this as an include_role above like the patch
+# https://review.openstack.org/525109
+# when https://review.openstack.org/#/c/521598 is in,
+# to optimize serialization
+- name: Execute the openstack-host role on containers
+  hosts: all_containers
+  become: true
+  gather_facts: true
+  pre_tasks:
+    - include: "common-tasks/test-set-nodepool-vars.yml"
+  roles:
+    - role: "openstack_hosts"
+  vars_files:
+    - test-vars.yml