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/tools/clientcmd/overrides.go

@@ -71,6 +71,7 @@ type ClusterOverrideFlags struct {
 	APIVersion            FlagInfo
 	CertificateAuthority  FlagInfo
 	InsecureSkipTLSVerify FlagInfo
+	TLSServerName         FlagInfo
 }
 
 // FlagInfo contains information about how to register a flag.  This struct is useful if you want to provide a way for an extender to
@@ -145,6 +146,7 @@ const (
 	FlagContext          = "context"
 	FlagNamespace        = "namespace"
 	FlagAPIServer        = "server"
+	FlagTLSServerName    = "tls-server-name"
 	FlagInsecure         = "insecure-skip-tls-verify"
 	FlagCertFile         = "client-certificate"
 	FlagKeyFile          = "client-key"
@@ -189,6 +191,7 @@ func RecommendedClusterOverrideFlags(prefix string) ClusterOverrideFlags {
 		APIServer:             FlagInfo{prefix + FlagAPIServer, "", "", "The address and port of the Kubernetes API server"},
 		CertificateAuthority:  FlagInfo{prefix + FlagCAFile, "", "", "Path to a cert file for the certificate authority"},
 		InsecureSkipTLSVerify: FlagInfo{prefix + FlagInsecure, "", "false", "If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure"},
+		TLSServerName:         FlagInfo{prefix + FlagTLSServerName, "", "", "If provided, this name will be used to validate server certificate. If this is not provided, hostname used to contact the server is used."},
 	}
 }
 
@@ -226,6 +229,7 @@ func BindClusterFlags(clusterInfo *clientcmdapi.Cluster, flags *pflag.FlagSet, f
 	flagNames.APIServer.BindStringFlag(flags, &clusterInfo.Server)
 	flagNames.CertificateAuthority.BindStringFlag(flags, &clusterInfo.CertificateAuthority)
 	flagNames.InsecureSkipTLSVerify.BindBoolFlag(flags, &clusterInfo.InsecureSkipTLSVerify)
+	flagNames.TLSServerName.BindStringFlag(flags, &clusterInfo.TLSServerName)
 }
 
 // BindFlags is a convenience method to bind the specified flags to their associated variables