kubernetes: windows: kubectl port-forward does not work

What happened:

/sig windows

What you expected to happen:

kubectl port-forward will generate the follow error when using Windows pods:

curl http://127.0.0.1:40271
Handling connection for 40271
E0610 14:21:10.685551  124724 portforward.go:400] an error occurred forwarding 40271 -> 80: error forwarding port 80 to pod 40c9dc69b4d527427b72ebe4d8ea4a6a794fd7acc96c20373d0257439654f98f, uid : unable to do port forwarding: socat not found.
curl: (52) Empty reply from server

This issue does not appear when using Linux pods.

How to reproduce it (as minimally and precisely as possible):

Run the following commands:

kubectl create -f pods/portforward.yaml  # https://paste.ubuntu.com/p/P8JQt7T8qk/
kubectl port-forward -n services-4435 pod/nodeport-test-6t4rs 9999:80 &
curl http://127.0.0.1:9999

The same scenario works when using Linux pods.

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): master (v1.16.0)
• Cloud provider or hardware configuration: N/A
• OS (e.g: cat /etc/os-release): Windows Server Datacenter 10.0.17763.379
• Kernel (e.g. uname -a): N/A
• Install tools: N/A
• Network plugin and version (if this is a network-related bug): azure-vnet-cni, flannel
• Others: