Log kube-env variables from startup script

cluster/gce/windows/k8s-node-setup.psm1

@@ -229,6 +229,13 @@ function Fetch-KubeEnv {
   # The type of kube_env is a powershell String.
   $kube_env = Get-InstanceMetadataAttribute 'kube-env'
   $kube_env_table = ConvertFrom_Yaml_KubeEnv ${kube_env}
+
+  Log-Output "Logging kube-env key-value pairs except CERT and KEY values"
+  foreach ($entry in $kube_env_table.GetEnumerator()) {
+    if ((-not ($entry.Name.contains("CERT"))) -and (-not ($entry.Name.contains("KEY")))) {
+      Log-Output "$($entry.Name): $($entry.Value)"
+    }
+  }
   return ${kube_env_table}
 }