Add kube-proxy daemonset track to GCE startup scripts (GCI, Debian and CoreOS).

cluster/saltbase/salt/kube-proxy/init.sls

@@ -7,6 +7,7 @@
     - makedirs: true
 
 # kube-proxy in a static pod
+{% if pillar.get('kube_proxy_daemonset', '').lower() != 'true' %}
 /etc/kubernetes/manifests/kube-proxy.manifest:
   file.managed:
     - source: salt://kube-proxy/kube-proxy.manifest
@@ -24,6 +25,7 @@
     - require:
       - service: docker
       - service: kubelet
+{% endif %}
 
 /var/log/kube-proxy.log:
   file.managed: