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/persistentvolume/pv_controller.go

@@ -45,6 +45,7 @@ import (
 	"k8s.io/kubernetes/pkg/controller/volume/persistentvolume/metrics"
 	pvutil "k8s.io/kubernetes/pkg/controller/volume/persistentvolume/util"
 	"k8s.io/kubernetes/pkg/features"
+	proxyutil "k8s.io/kubernetes/pkg/proxy/util"
 	"k8s.io/kubernetes/pkg/util/goroutinemap"
 	"k8s.io/kubernetes/pkg/util/goroutinemap/exponentialbackoff"
 	vol "k8s.io/kubernetes/pkg/volume"
@@ -235,6 +236,9 @@ type PersistentVolumeController struct {
 
 	translator               CSINameTranslator
 	csiMigratedPluginManager CSIMigratedPluginManager
+
+	// filteredDialOptions configures any dialing done by the controller.
+	filteredDialOptions *proxyutil.FilteredDialOptions
 }
 
 // syncClaim is the main controller method to decide what to do with a claim.