MNAIO: Use file instead of command for disk image clean-up

Rather than use the command module, we use the file module
which is idempotent. We also remove the conditional for the
clean up so that it's easier to switch between back-ends
and still have the clean-up happen.

Change-Id: I5d77bbd236d1cb7d45bc4dda4206475b5663b1c0

multi-node-aio/playbooks/deploy-vms.yml

@@ -45,16 +45,14 @@
       failed_when: false
       when:
         - hostvars[item]['server_vm'] | default(false) | bool
-        - default_vm_disk_mode | default('lvm') == "lvm"
       with_items: "{{ groups['pxe_servers'] }}"
 
     - name: Delete VM Disk Image
-      command: |
-        rm -f /var/lib/libvirt/images/{{ hostvars[item]['server_hostname'] }}.img
-      failed_when: false
+      file:
+        path: "/var/lib/libvirt/images/{{ hostvars[item]['server_hostname'] }}.img"
+        state: absent
       when:
         - hostvars[item]['server_vm'] | default(false) | bool
-        - default_vm_disk_mode | default('lvm') == "file"
       with_items: "{{ groups['pxe_servers'] }}"
 
     - name: Create VM LV