Disable pvc-flush service while rebooting

Prevents the flush daemon from starting on node boot, before the
playbook is actually ready to unflush the node.

oneshot/update-pvc-cluster.yml

@@ -95,10 +95,11 @@
           become: no
           connection: local
 
-        - name: stop PVC flush daemon cleanly
+        - name: stop and disable PVC flush daemon cleanly
           service:
             name: "pvc-flush"
             state: stopped
+            enabled: no
 
         - name: stop PVC daemon cleanly
           service:
@@ -143,6 +144,12 @@
           become: no
           connection: local
   
+        - name: start and enable PVC flush daemon cleanly
+          service:
+            name: "pvc-flush"
+            state: started
+            enabled: yes
+
         - name: reset any systemd failures
           command: systemctl reset-failed
       when: freshness.changed or kernelversion.changed