[nat64_appliance] Check if virtqemud socket exists during the cleanup

Since most of the cleanup operations are performed via libvirt, we are
going to test if the service is up checking for the existance of the
`virtqemud` socket.

roles/nat64_appliance/tasks/cleanup.yml

@@ -19,44 +19,52 @@
     state: absent
     path: "{{ cifmw_nat64_appliance_workdir }}/nat64-appliance.qcow2"
 
-- name: List VMs
-  register: _list_vms
-  community.libvirt.virt:
-    command: list_vms
+- name: Get virtqemud socket
+  register: _virtqemud
+  ansible.builtin.stat:
+    path: "/var/run/libvirt/virtqemud-sock"
 
-- name: Stop the nat64_appliance VM
-  when: cifmw_nat64_appliance_name in _list_vms.list_vms
-  community.libvirt.virt:
-    command: destroy
-    name: "{{ cifmw_nat64_appliance_name }}"
-    uri: "{{ cifmw_nat64_libvirt_uri }}"
+- name: Perform the libvirt cleanup
+  when: _virtqemud.stat.exists
+  block:
+    - name: List VMs
+      register: _list_vms
+      community.libvirt.virt:
+        command: list_vms
 
-- name: Undefine the nat64_appliance VM
-  when: cifmw_nat64_appliance_name in _list_vms.list_vms
-  community.libvirt.virt:
-    command: undefine
-    name: "{{ cifmw_nat64_appliance_name }}"
-    force: true
-    uri: "{{ cifmw_nat64_libvirt_uri }}"
+    - name: Stop the nat64_appliance VM
+      when: cifmw_nat64_appliance_name in _list_vms.list_vms
+      community.libvirt.virt:
+        command: destroy
+        name: "{{ cifmw_nat64_appliance_name }}"
+        uri: "{{ cifmw_nat64_libvirt_uri }}"
 
-- name: Destroy the nat64 networks
-  register: net_destroy
-  community.libvirt.virt_net:
-    command: destroy
-    name: "{{ item }}"
-    uri: "{{ cifmw_nat64_libvirt_uri }}"
-  loop:
-    - "{{ cifmw_nat64_network_ipv4_name }}"
-    - "{{ cifmw_nat64_network_ipv6_name }}"
-  failed_when:
-    - net_destroy.rc is defined
-    - net_destroy.rc > 1
+    - name: Undefine the nat64_appliance VM
+      when: cifmw_nat64_appliance_name in _list_vms.list_vms
+      community.libvirt.virt:
+        command: undefine
+        name: "{{ cifmw_nat64_appliance_name }}"
+        force: true
+        uri: "{{ cifmw_nat64_libvirt_uri }}"
 
-- name: Undefine the nat64 networks
-  community.libvirt.virt_net:
-    command: undefine
-    name: "{{ item }}"
-    uri: "{{ cifmw_nat64_libvirt_uri }}"
-  loop:
-    - "{{ cifmw_nat64_network_ipv4_name }}"
-    - "{{ cifmw_nat64_network_ipv6_name }}"
+    - name: Destroy the nat64 networks
+      register: net_destroy
+      community.libvirt.virt_net:
+        command: destroy
+        name: "{{ item }}"
+        uri: "{{ cifmw_nat64_libvirt_uri }}"
+      loop:
+        - "{{ cifmw_nat64_network_ipv4_name }}"
+        - "{{ cifmw_nat64_network_ipv6_name }}"
+      failed_when:
+        - net_destroy.rc is defined
+        - net_destroy.rc > 1
+
+    - name: Undefine the nat64 networks
+      community.libvirt.virt_net:
+        command: undefine
+        name: "{{ item }}"
+        uri: "{{ cifmw_nat64_libvirt_uri }}"
+      loop:
+        - "{{ cifmw_nat64_network_ipv4_name }}"
+        - "{{ cifmw_nat64_network_ipv6_name }}"