Adds filtering of hosts to DialContexts.

The provided DialContext wraps existing clients' DialContext in an attempt to
preserve any existing timeout configuration. In some cases, we may replace
infinite timeouts with golang defaults.

- scaleio: tcp connect/keepalive values changed from 0/15 to 30/30
- storageos: no change

pkg/controller/volume/expand/expand_controller.go

@@ -47,6 +47,7 @@ import (
 	cloudprovider "k8s.io/cloud-provider"
 	v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
 	"k8s.io/kubernetes/pkg/controller/volume/events"
+	proxyutil "k8s.io/kubernetes/pkg/proxy/util"
 	"k8s.io/kubernetes/pkg/volume"
 	"k8s.io/kubernetes/pkg/volume/csimigration"
 	"k8s.io/kubernetes/pkg/volume/util"
@@ -104,6 +105,8 @@ type expandController struct {
 	translator CSINameTranslator
 
 	csiMigratedPluginManager csimigration.PluginManager
+
+	filteredDialOptions *proxyutil.FilteredDialOptions
 }
 
 // NewExpandController expands the pvs
@@ -115,7 +118,8 @@ func NewExpandController(
 	cloud cloudprovider.Interface,
 	plugins []volume.VolumePlugin,
 	translator CSINameTranslator,
-	csiMigratedPluginManager csimigration.PluginManager) (ExpandController, error) {
+	csiMigratedPluginManager csimigration.PluginManager,
+	filteredDialOptions *proxyutil.FilteredDialOptions) (ExpandController, error) {
 
 	expc := &expandController{
 		kubeClient:               kubeClient,
@@ -129,6 +133,7 @@ func NewExpandController(
 		queue:                    workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "volume_expand"),
 		translator:               translator,
 		csiMigratedPluginManager: csiMigratedPluginManager,
+		filteredDialOptions:      filteredDialOptions,
 	}
 
 	if err := expc.volumePluginMgr.InitPlugins(plugins, nil, expc); err != nil {
@@ -449,3 +454,7 @@ func (expc *expandController) GetSubpather() subpath.Interface {
 	// not needed for expand controller
 	return nil
 }
+
+func (expc *expandController) GetFilteredDialOptions() *proxyutil.FilteredDialOptions {
+	return expc.filteredDialOptions
+}