Fix wincat to correctly detect when to interrupt/disconnect
Fix wincat to correctly detect when to interrupt/disconnect

Previously wasn't closing if the server disconnected, which was causing
e2e tests to fail.

https://github.com/kubernetes/kubernetes/issues/78857

Signed-off-by: Ben Moss <80bec717c12290923c80384e0a5fc28cdf75a97e@pivotal.io>

kubernetes-sigs/sig-windows-tools,kubernetes-sigs/sig-windows-tools,kubernetes-sigs/sig-windows-tools,kubernetes-sigs/sig-windows-tools,kubernetes-sigs/sig-windows-tools