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/kubelet/volume_host.go

@@ -38,6 +38,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/configmap"
 	"k8s.io/kubernetes/pkg/kubelet/secret"
 	"k8s.io/kubernetes/pkg/kubelet/token"
+	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"
@@ -151,6 +152,11 @@ func (kvh *kubeletVolumeHost) GetSubpather() subpath.Interface {
 	return kvh.kubelet.subpather
 }
 
+func (kvh *kubeletVolumeHost) GetFilteredDialOptions() *proxyutil.FilteredDialOptions {
+	// FilteredDial is not needed in the kubelet.
+	return nil
+}
+
 func (kvh *kubeletVolumeHost) GetHostUtil() hostutil.HostUtils {
 	return kvh.kubelet.hostutil
 }