cmd/cli: only set DNS for physical interfaces on Windows

By filtering the interfaces by MAC address instead of name.

cmd/cli/net_windows.go

@@ -0,0 +1,21 @@
+package cli
+
+import (
+	"net"
+)
+
+func patchNetIfaceName(iface *net.Interface) error {
+	return nil
+}
+
+// validInterface reports whether the *net.Interface is a valid one.
+// On Windows, only physical interfaces are considered valid.
+func validInterface(iface *net.Interface) bool {
+	if iface == nil {
+		return false
+	}
+	if isPhysicalInterface(iface.HardwareAddr.String()) {
+		return true
+	}
+	return false
+}