Cleanup all container startup configs before generating the new ones

Unlike the container puppet configs [1], we didn't have a mechanism that
was purging the old configs previously generated by the container
startup config tasks. It's problematic when some leftover configs are
still on the host and not needed anymore.

[1] https://opendev.org/openstack/tripleo-ansible/src/branch/master/tripleo_ansible/ansible_plugins/modules/container_puppet_config.py#L157-L159

Change-Id: I24dac79f2351a1ffd4e956584a80f623706cbd00
Closes-Bug: #1884537
(cherry picked from commit b1d3da8666)

common/container_startup_configs_tasks.yaml

@@ -1,18 +1,23 @@
 ---
-- set_fact:
-    step_path: "{{ item.0 }}"
 
-- name: "Create directory for {{ step_path }} container startup configs"
+# TODO(emilien) convert this whole task in a module
+# https://bugs.launchpad.net/tripleo/+bug/1884577
+- name: "Remove old {{ item.0 }} container startup configs"
   file:
-    path: "/var/lib/tripleo-config/container-startup-config/{{ step_path }}/"
+    path: "/var/lib/tripleo-config/container-startup-config/{{ item.0 }}"
+    state: absent
+
+- name: "Create directory for {{ item.0 }} container startup configs"
+  file:
+    path: "/var/lib/tripleo-config/container-startup-config/{{ item.0 }}/"
     mode: 0600
     recurse: yes
     setype: svirt_sandbox_file_t
 
-- name: "Creating container startup configs for {{ step_path }}"
+- name: "Creating container startup configs for {{ item.0 }}"
   copy:
     content: "{{ startup_data.value | to_nice_json }}"
-    dest: "/var/lib/tripleo-config/container-startup-config/{{ step_path }}/{{ startup_data.key }}.json"
+    dest: "/var/lib/tripleo-config/container-startup-config/{{ item.0 }}/{{ startup_data.key }}.json"
     setype: container_file_t
     mode: 0600
   no_log: true