update kube and vendor dependencies

With kubernetes 1.18 release of client-go, signatures on methods in
generated clientsets, dynamic, metadata, and scale clients have been
modified to accept context.Context as a first argument.
Signatures of Create, Update, and Patch methods have been updated
to accept CreateOptions, UpdateOptions and PatchOptions respectively.
Signatures of Delete and DeleteCollection methods now accept
DeleteOptions by value instead of by reference.
These changes are now accommodated with this PR and client-go
and dependencies are updated to v1.18.0

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

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

@@ -25,6 +25,7 @@ import (
 	"time"
 
 	utilnet "k8s.io/apimachinery/pkg/util/net"
+	"k8s.io/apimachinery/pkg/util/wait"
 )
 
 // TlsTransportCache caches TLS http.RoundTrippers different configurations. The
@@ -44,6 +45,8 @@ type tlsCacheKey struct {
 	caData             string
 	certData           string
 	keyData            string
+	certFile           string
+	keyFile            string
 	getCert            string
 	serverName         string
 	nextProtos         string
@@ -91,6 +94,16 @@ func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
 			KeepAlive: 30 * time.Second,
 		}).DialContext
 	}
+
+	// If we use are reloading files, we need to handle certificate rotation properly
+	// TODO(jackkleeman): We can also add rotation here when config.HasCertCallback() is true
+	if config.TLS.ReloadTLSFiles {
+		dynamicCertDialer := certRotatingDialer(tlsConfig.GetClientCertificate, dial)
+		tlsConfig.GetClientCertificate = dynamicCertDialer.GetClientCertificate
+		dial = dynamicCertDialer.connDialer.DialContext
+		go dynamicCertDialer.Run(wait.NeverStop)
+	}
+
 	// Cache a single transport for these options
 	c.transports[key] = utilnet.SetTransportDefaults(&http.Transport{
 		Proxy:               http.ProxyFromEnvironment,
@@ -109,15 +122,23 @@ func tlsConfigKey(c *Config) (tlsCacheKey, error) {
 	if err := loadTLSFiles(c); err != nil {
 		return tlsCacheKey{}, err
 	}
-	return tlsCacheKey{
+	k := tlsCacheKey{
 		insecure:           c.TLS.Insecure,
 		caData:             string(c.TLS.CAData),
-		certData:           string(c.TLS.CertData),
-		keyData:            string(c.TLS.KeyData),
 		getCert:            fmt.Sprintf("%p", c.TLS.GetCert),
 		serverName:         c.TLS.ServerName,
 		nextProtos:         strings.Join(c.TLS.NextProtos, ","),
 		dial:               fmt.Sprintf("%p", c.Dial),
 		disableCompression: c.DisableCompression,
-	}, nil
+	}
+
+	if c.TLS.ReloadTLSFiles {
+		k.certFile = c.TLS.CertFile
+		k.keyFile = c.TLS.KeyFile
+	} else {
+		k.certData = string(c.TLS.CertData)
+		k.keyData = string(c.TLS.KeyData)
+	}
+
+	return k, nil
 }