Neutron's L3 agent needs to be able to load modules

Neutron invokes ip[6]tables which sometimes requires the ability to
load modules.

Change-Id: Id55bdc82e08a3aeeb19be5906b64384c36b91f6e

neutron/templates/daemonset-l3-agent.yaml

@@ -83,6 +83,9 @@ spec:
               readOnly: true
             - name: runopenvswitch
               mountPath: /run/openvswitch
+            - name: libmodules
+              mountPath: /lib/modules
+              readOnly: true
             - name: socket
               mountPath: /var/lib/neutron/stackanetes
 {{ if $mounts_neutron_l3_agent.volumeMounts }}{{ toYaml $mounts_neutron_l3_agent.volumeMounts | indent 12 }}{{ end }}
@@ -96,6 +99,9 @@ spec:
         - name: runopenvswitch
           hostPath:
             path: /run/openvswitch
+        - name: libmodules
+          hostPath:
+            path: /lib/modules
         - name: socket
           hostPath:
             path: /var/lib/neutron/stackanetes