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/volume/plugins.go

@@ -39,6 +39,7 @@ import (
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/tools/record"
 	cloudprovider "k8s.io/cloud-provider"
+	proxyutil "k8s.io/kubernetes/pkg/proxy/util"
 	"k8s.io/kubernetes/pkg/volume/util/hostutil"
 	"k8s.io/kubernetes/pkg/volume/util/recyclerclient"
 	"k8s.io/kubernetes/pkg/volume/util/subpath"
@@ -450,6 +451,9 @@ type VolumeHost interface {
 
 	// Returns an interface that should be used to execute subpath operations
 	GetSubpather() subpath.Interface
+
+	// Returns options to pass for proxyutil filtered dialers.
+	GetFilteredDialOptions() *proxyutil.FilteredDialOptions
 }
 
 // VolumePluginMgr tracks registered plugins.