Extend rke to tolerate the Windows host

1. Support to configure Flannel as "host-gw" backend
2. Define the network component yaml and ingress
   controller yaml only schedule to non-Windows node
3. Support to configure Docker container's port publishing

templates/nginx-ingress.go

@@ -176,6 +176,15 @@ spec:
         prometheus.io/port: '10254'
         prometheus.io/scrape: 'true'
     spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+              - matchExpressions:
+                - key: beta.kubernetes.io/os
+                  operator: NotIn
+                  values:
+                    - windows
       hostNetwork: true
       nodeSelector:
       {{ range $k, $v := .NodeSelector }}