Update kubernetes to v1.8.0-rc.1

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/k8s.io/client-go/rest/config.go

@@ -114,6 +114,9 @@ type Config struct {
 	// The maximum length of time to wait before giving up on a server request. A value of zero means no timeout.
 	Timeout time.Duration
 
+	// Dial specifies the dial function for creating unencrypted TCP connections.
+	Dial func(network, addr string) (net.Conn, error)
+
 	// Version forces a specific version to be used (if registered)
 	// Do we need this?
 	// Version string

vendor/k8s.io/client-go/rest/transport.go

@@ -96,5 +96,6 @@ func (c *Config) TransportConfig() (*transport.Config, error) {
 			Groups:   c.Impersonate.Groups,
 			Extra:    c.Impersonate.Extra,
 		},
+		Dial: c.Dial,
 	}, nil
 }

vendor/k8s.io/client-go/transport/cache.go

@@ -63,16 +63,20 @@ func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
 		return http.DefaultTransport, nil
 	}
 
+	dial := config.Dial
+	if dial == nil {
+		dial = (&net.Dialer{
+			Timeout:   30 * time.Second,
+			KeepAlive: 30 * time.Second,
+		}).Dial
+	}
 	// Cache a single transport for these options
 	c.transports[key] = utilnet.SetTransportDefaults(&http.Transport{
 		Proxy:               http.ProxyFromEnvironment,
 		TLSHandshakeTimeout: 10 * time.Second,
 		TLSClientConfig:     tlsConfig,
 		MaxIdleConnsPerHost: idleConnsPerHost,
-		Dial: (&net.Dialer{
-			Timeout:   30 * time.Second,
-			KeepAlive: 30 * time.Second,
-		}).Dial,
+		Dial:                dial,
 	})
 	return c.transports[key], nil
 }

vendor/k8s.io/client-go/transport/config.go

@@ -16,7 +16,10 @@ limitations under the License.
 
 package transport
 
-import "net/http"
+import (
+	"net"
+	"net/http"
+)
 
 // Config holds various options for establishing a transport.
 type Config struct {
@@ -52,6 +55,9 @@ type Config struct {
 	// config may layer other RoundTrippers on top of the returned
 	// RoundTripper.
 	WrapTransport func(rt http.RoundTripper) http.RoundTripper
+
+	// Dial specifies the dial function for creating unencrypted TCP connections.
+	Dial func(network, addr string) (net.Conn, error)
 }
 
 // ImpersonationConfig has all the available impersonation options