nova-evacuate: Disable libvirtd service and sockets during negative tests

The recent switch to Focal introduced a change in behaviour for the
libvirtd service that can now be restarted through new systemd socket
services associated with it once stopped. As we need it to remain
stopped during the initial negative evacuation tests on the controller
we now need to also stop these socket services and then later restart
them.

Change-Id: I2333872670e9e6c905efad7461af4d149f8216b6

roles/run-evacuate-hook/tasks/main.yaml

@@ -34,8 +34,13 @@
 - name: Stop libvirtd on "{{ inventory_hostname }}"
   become: true
   systemd:
-    name: libvirtd
+    name: "{{ item }}"
     state: stopped
+  with_items:
+    - libvirtd.service
+    - libvirtd.socket
+    - libvirtd-admin.socket
+    - libvirtd-ro.socket
 
 - name: Run negative evacuate tests
   become: true
@@ -47,8 +52,13 @@
 - name: Start libvirtd on "{{ inventory_hostname }}"
   become: true
   systemd:
-    name: libvirtd
+    name: "{{ item }}"
     state: started
+  with_items:
+    - libvirtd.service
+    - libvirtd.socket
+    - libvirtd-admin.socket
+    - libvirtd-ro.socket
 
 - name: Run evacuate tests
   become: true