nova-libvirt: set 'cpuset_cpus' to 'all'

nova-compute-libvirt should be able to run on any CPU, as it launch VMs on
isolated CPUs (they are isolated to be dedicated to run vCPU).

This patch makes sure the right container configurations is applied with
Paunch.

Change-Id: I9b8893e4812a7a3f71bd75f66004ed8d6f67b3d1
(cherry picked from commit 1cbc1ee387)

docker/services/nova-libvirt.yaml

@@ -324,6 +324,7 @@ outputs:
             pid: host
             privileged: true
             restart: always
+            cpuset_cpus: all
             volumes:
               list_concat:
                 - {get_attr: [ContainersCommon, volumes]}