Change command for shell

The nspawn container destory command uses a pipe which is not allowed in
the command module. To correct this the shell module is used.

Change-Id: I7dacedfb62e9fd70d7b7c3130ac5af3d05711024
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

playbooks/containers-nspawn-destroy.yml

@@ -51,7 +51,7 @@
       delegate_to: "{{ physical_host }}"
 
     - name: Get machine-id
-      command: >-
+      shell: >-
         hostnamectl --machine="{{ inventory_hostname }}" status | awk '/Machine ID/ {print $3}'
       register: _container_machine_id
       delegate_to: "{{ physical_host }}"