Fix list_concat for Nfs mounts

When NovaNfsEnabled: True, we try to include var-lib-nova-instances.mount.
The syntax for list_concat in the template is currently incorrect which
results in an error while rendering the template.

Resolves: rhbz#2151009
Change-Id: Ic9ed13264f4f66aa04f90621972c6262de4a98e2

deployment/nova/nova-compute-container-puppet.yaml

@@ -1385,7 +1385,7 @@ outputs:
                     - - tripleo_nova_libvirt.target
                     - if:
                       - {get_param: NovaNfsEnabled}
-                      - var-lib-nova-instances.mount
+                      - - var-lib-nova-instances.mount
                 healthcheck: {get_attr: [ContainersCommon, healthcheck_rpc_port]}
                 volumes:
                   list_concat: