fix: ignore EOF errors from Kubernetes API when converting control plane

During the conversion process, API server goes down, so we can see lots
of network errors including EOF.

Fixes #3404

Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
(cherry picked from commit e039172)

pkg/cluster/kubernetes/kubernetes.go

@@ -7,6 +7,7 @@ package kubernetes
 
 import (
 	"errors"
+	"io"
 	"net"
 	"syscall"
 
@@ -18,6 +19,10 @@ func retryableError(err error) bool {
 		return true
 	}
 
+	if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
+		return true
+	}
+
 	netErr := &net.OpError{}
 
 	if errors.As(err, &netErr) {