Update go dependencies (#2234)

vendor/k8s.io/kubernetes/pkg/cloudprovider/cloud.go

@@ -44,8 +44,6 @@ type Interface interface {
 	Routes() (Routes, bool)
 	// ProviderName returns the cloud provider ID.
 	ProviderName() string
-	// ScrubDNS provides an opportunity for cloud-provider-specific code to process DNS settings for pods.
-	ScrubDNS(nameservers, searches []string) (nsOut, srchOut []string)
 	// HasClusterID returns true if a ClusterID is required and set
 	HasClusterID() bool
 }

vendor/k8s.io/kubernetes/pkg/cloudprovider/plugins.go

@@ -60,18 +60,6 @@ func IsCloudProvider(name string) bool {
 	return found
 }
 
-// CloudProviders returns the name of all registered cloud providers in a
-// string slice
-func CloudProviders() []string {
-	names := []string{}
-	providersMutex.Lock()
-	defer providersMutex.Unlock()
-	for name := range providers {
-		names = append(names, name)
-	}
-	return names
-}
-
 // GetCloudProvider creates an instance of the named cloud provider, or nil if
 // the name is unknown.  The error return is only used if the named provider
 // was known but failed to initialize. The config parameter specifies the