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/testing/testing.go

@@ -46,6 +46,7 @@ import (
 	"k8s.io/client-go/tools/record"
 	utiltesting "k8s.io/client-go/util/testing"
 	cloudprovider "k8s.io/cloud-provider"
+	proxyutil "k8s.io/kubernetes/pkg/proxy/util"
 	. "k8s.io/kubernetes/pkg/volume"
 	"k8s.io/kubernetes/pkg/volume/util"
 	"k8s.io/kubernetes/pkg/volume/util/hostutil"
@@ -118,6 +119,7 @@ type fakeVolumeHost struct {
 	informerFactory        informers.SharedInformerFactory
 	kubeletErr             error
 	mux                    sync.Mutex
+	filteredDialOptions    *proxyutil.FilteredDialOptions
 }
 
 var _ VolumeHost = &fakeVolumeHost{}
@@ -207,6 +209,10 @@ func (f *fakeVolumeHost) GetSubpather() subpath.Interface {
 	return f.subpather
 }
 
+func (f *fakeVolumeHost) GetFilteredDialOptions() *proxyutil.FilteredDialOptions {
+	return f.filteredDialOptions
+}
+
 func (f *fakeVolumeHost) GetPluginMgr() *VolumePluginMgr {
 	return f.pluginMgr
 }