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/component-base/metrics/desc.go

@@ -18,7 +18,6 @@ package metrics
 
 import (
 	"fmt"
-	"strings"
 	"sync"
 
 	"github.com/blang/semver"
@@ -42,7 +41,8 @@ type Desc struct {
 	variableLabels []string
 
 	// promDesc is the descriptor used by every Prometheus Metric.
-	promDesc *prometheus.Desc
+	promDesc      *prometheus.Desc
+	annotatedHelp string
 
 	// stabilityLevel represents the API guarantees for a given defined metric.
 	stabilityLevel StabilityLevel
@@ -73,6 +73,7 @@ func NewDesc(fqName string, help string, variableLabels []string, constLabels La
 	d := &Desc{
 		fqName:            fqName,
 		help:              help,
+		annotatedHelp:     help,
 		variableLabels:    variableLabels,
 		constLabels:       constLabels,
 		stabilityLevel:    stabilityLevel,
@@ -86,6 +87,7 @@ func NewDesc(fqName string, help string, variableLabels []string, constLabels La
 // String formats the Desc as a string.
 // The stability metadata maybe annotated in 'HELP' section if called after registry,
 // otherwise not.
+// e.g. "Desc{fqName: "normal_stable_descriptor", help: "[STABLE] this is a stable descriptor", constLabels: {}, variableLabels: []}"
 func (d *Desc) String() string {
 	if d.isCreated {
 		return d.promDesc.String()
@@ -136,22 +138,76 @@ func (d *Desc) IsDeprecated() bool {
 	return d.isDeprecated
 }
 
+// IsCreated returns if metric has been created.
+func (d *Desc) IsCreated() bool {
+	d.createLock.RLock()
+	defer d.createLock.RUnlock()
+
+	return d.isCreated
+}
+
+// create forces the initialization of Desc which has been deferred until
+// the point at which this method is invoked. This method will determine whether
+// the Desc is deprecated or hidden, no-opting if the Desc should be considered
+// hidden. Furthermore, this function no-opts and returns true if Desc is already
+// created.
+func (d *Desc) create(version *semver.Version) bool {
+	if version != nil {
+		d.determineDeprecationStatus(*version)
+	}
+
+	// let's not create if this metric is slated to be hidden
+	if d.IsHidden() {
+		return false
+	}
+	d.createOnce.Do(func() {
+		d.createLock.Lock()
+		defer d.createLock.Unlock()
+
+		d.isCreated = true
+		if d.IsDeprecated() {
+			d.initializeDeprecatedDesc()
+		} else {
+			d.initialize()
+		}
+	})
+	return d.IsCreated()
+}
+
+// ClearState will clear all the states marked by Create.
+// It intends to be used for re-register a hidden metric.
+func (d *Desc) ClearState() {
+	d.isDeprecated = false
+	d.isHidden = false
+	d.isCreated = false
+
+	d.markDeprecationOnce = *new(sync.Once)
+	d.createOnce = *new(sync.Once)
+	d.deprecateOnce = *new(sync.Once)
+	d.hideOnce = *new(sync.Once)
+	d.annotateOnce = *new(sync.Once)
+
+	d.annotatedHelp = d.help
+	d.promDesc = nil
+}
+
 func (d *Desc) markDeprecated() {
 	d.deprecateOnce.Do(func() {
-		d.help = fmt.Sprintf("(Deprecated since %s) %s", d.deprecatedVersion, d.help)
+		d.annotatedHelp = fmt.Sprintf("(Deprecated since %s) %s", d.deprecatedVersion, d.annotatedHelp)
 	})
 }
 
 func (d *Desc) annotateStabilityLevel() {
 	d.annotateOnce.Do(func() {
-		d.help = fmt.Sprintf("[%v] %v", d.stabilityLevel, d.help)
+		d.annotatedHelp = fmt.Sprintf("[%v] %v", d.stabilityLevel, d.annotatedHelp)
 	})
 }
 
 func (d *Desc) initialize() {
 	d.annotateStabilityLevel()
+
 	// this actually creates the underlying prometheus desc.
-	d.promDesc = prometheus.NewDesc(d.fqName, d.help, d.variableLabels, prometheus.Labels(d.constLabels))
+	d.promDesc = prometheus.NewDesc(d.fqName, d.annotatedHelp, d.variableLabels, prometheus.Labels(d.constLabels))
 }
 
 func (d *Desc) initializeDeprecatedDesc() {
@@ -165,9 +221,5 @@ func (d *Desc) initializeDeprecatedDesc() {
 //   1. Desc `D` is registered to registry 'A' in TestA (Note: `D` maybe created)
 //   2. Desc `D` is registered to registry 'B' in TestB (Note: since 'D' has been created once, thus will be ignored by registry 'B')
 func (d *Desc) GetRawDesc() *Desc {
-	// remove stability from help if any
-	stabilityStr := fmt.Sprintf("[%v] ", d.stabilityLevel)
-	rawHelp := strings.Replace(d.help, stabilityStr, "", -1)
-
-	return NewDesc(d.fqName, rawHelp, d.variableLabels, d.constLabels, d.stabilityLevel, d.deprecatedVersion)
+	return NewDesc(d.fqName, d.help, d.variableLabels, d.constLabels, d.stabilityLevel, d.deprecatedVersion)
 }