Non-timeout network errors are not fatal for removing offloaders.

We assume that haproxy has been stopped (and the Pod may have been
deleted).

Go's "permanent network error" is now deprecated, so we limit this
distinction to timeout errors.

pkg/haproxy/haproxy.go

@@ -41,6 +41,7 @@ import (
 	"time"
 
 	"code.uplex.de/uplex-varnish/k8s-ingress/pkg/interfaces"
+	"code.uplex.de/uplex-varnish/k8s-ingress/pkg/net"
 	"code.uplex.de/uplex-varnish/k8s-ingress/pkg/update"
 
 	"github.com/sirupsen/logrus"
@@ -593,7 +594,9 @@ func (hc *Controller) removeOffldrInstances(
 			"%d", inst.name, version)
 		tx, err := inst.dplane.StartTx(version)
 		if err != nil {
-			errs = append(errs, inst.mkError(err))
+			if !net.IsNonTimeoutNetErr(err, hc.log) {
+				errs = append(errs, inst.mkError(err))
+			}
 			continue
 		}
 		hc.log.Debugf("haproxy instance %s: started transaction: %+v",