Make Windows multi-cluster

Make Windows a multi-cluster example. Allow test to use fleet binaries
from any path.

multi-cluster/windows-helm/Chart.yaml

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+apiVersion: v2
+name: windows-app
+description: Sample Windows application
+version: 0.0.0
+appVersion: 0.0.0

multi-cluster/windows-helm/README.md

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+# Windows Helm Example
+
+This example will deploy the [Windows application example](https://kubernetes.io/docs/setup/production-environment/windows/user-guide-windows-containers/) packaged as a Helm chart.
+This must be deployed in a multi-cluster configuration.
+
+## Preparing Your Downstream Cluster(s)
+
+Clusters (`clusters.fleet.cattle.io`) must have the `windows.version` label in order for the example to be deployed.
+You can determine the value for the `windows.version` label key based on the release version of your Windows node(s).
+
+Description | Example
+--- | ---
+For Windows Server SAC nodes, the value will be the SAC release number prepended with "win". | 2004 SAC would result in `windows.version: win2004`
+For Windows Server LTSC nodes, the value will be the SAC release number that the LTSC is based on. | 2019 LTSC would result in `windows.version: win1809`
+
+## Creating the GitRepo
+
+Create the following `GitRepo` in your local cluster to get started.
+
+```yaml
+kind: GitRepo
+apiVersion: fleet.cattle.io/v1alpha1
+metadata:
+  name: helm
+  namespace: fleet-default
+spec:
+  repo: https://github.com/rancher/fleet-examples
+  paths:
+  - multi-cluster/windows-helm
+  targets:
+  - name: win2004
+    clusterSelector:
+      matchLabels:
+        windows.version: win2004
+  - name: win1909
+    clusterSelector:
+      matchLabels:
+        windows.version: win1909
+  - name: win1903
+    clusterSelector:
+      matchLabels:
+        windows.version: win1903
+  - name: win1809
+    clusterSelector:
+      matchLabels:
+        windows.version: win1809
+```

multi-cluster/windows-helm/fleet.yaml

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+namespace: fleet-helm-windows-example
+targetCustomizations:
+- name: win2004
+  helm:
+    values:
+      image:
+        tag: 2004
+  clusterSelector:
+    matchLabels:
+      windows.version: win2004
+- name: win1909
+  helm:
+    values:
+      image:
+        tag: 1909
+  clusterSelector:
+    matchLabels:
+      windows.version: win1909
+- name: win1903
+  helm:
+    values:
+      image:
+        tag: 1903
+  clusterSelector:
+    matchLabels:
+      windows.version: win1903
+- name: win1809
+  helm:
+    values:
+      image:
+        tag: 1809
+  clusterSelector:
+    matchLabels:
+      windows.version: win1809

multi-cluster/windows-helm/templates/windows.yaml

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+# Source: https://kubernetes.io/docs/setup/production-environment/windows/user-guide-windows-containers/
+apiVersion: v1
+kind: Service
+metadata:
+  name: win-webserver
+  labels:
+    app: win-webserver
+spec:
+  ports:
+    # the port that this service should serve on
+    - port: 80
+      targetPort: 80
+  selector:
+    app: win-webserver
+  type: NodePort
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: win-webserver
+  name: win-webserver
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: win-webserver
+  template:
+    metadata:
+      labels:
+        app: win-webserver
+      name: win-webserver
+    spec:
+      containers:
+      - name: windowswebserver
+        image: "mcr.microsoft.com/windows/servercore:{{ .Values.image.tag }}"
+        command:
+        - powershell.exe
+        - -command
+        - "<#code used from https://gist.github.com/19WAS85/5424431#> ; $$listener = New-Object System.Net.HttpListener ; $$listener.Prefixes.Add('http://*:80/') ; $$listener.Start() ; $$callerCounts = @{} ; Write-Host('Listening at http://*:80/') ; while ($$listener.IsListening) { ;$$context = $$listener.GetContext() ;$$requestUrl = $$context.Request.Url ;$$clientIP = $$context.Request.RemoteEndPoint.Address ;$$response = $$context.Response ;Write-Host '' ;Write-Host('> {0}' -f $$requestUrl) ;  ;$$count = 1 ;$$k=$$callerCounts.Get_Item($$clientIP) ;if ($$k -ne $$null) { $$count += $$k } ;$$callerCounts.Set_Item($$clientIP, $$count) ;$$ip=(Get-NetAdapter | Get-NetIpAddress); $$header='<html><body><H1>Windows Container Web Server</H1>' ;$$callerCountsString='' ;$$callerCounts.Keys | % { $$callerCountsString+='<p>IP {0} callerCount {1} ' -f $$ip[1].IPAddress,$$callerCounts.Item($$_) } ;$$footer='</body></html>' ;$$content='{0}{1}{2}' -f $$header,$$callerCountsString,$$footer ;Write-Output $$content ;$$buffer = [System.Text.Encoding]::UTF8.GetBytes($$content) ;$$response.ContentLength64 = $$buffer.Length ;$$response.OutputStream.Write($$buffer, 0, $$buffer.Length) ;$$response.Close() ;$$responseStatus = $$response.StatusCode ;Write-Host('< {0}' -f $$responseStatus)  } ; "
+      nodeSelector:
+        kubernetes.io/os: windows
+      tolerations:
+      - key: cattle.io/os
+        operator: "Equal"
+        value: "windows"
+        effect: NoSchedule

multi-cluster/windows-helm/values.yaml

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+image:
+  tag: 2004