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/util/workqueue/metrics.go

@@ -131,16 +131,14 @@ func (m *defaultQueueMetrics) updateUnfinishedWork() {
 	var total float64
 	var oldest float64
 	for _, t := range m.processingStartTimes {
-		age := m.sinceInMicroseconds(t)
+		age := m.sinceInSeconds(t)
 		total += age
 		if age > oldest {
 			oldest = age
 		}
 	}
-	// Convert to seconds; microseconds is unhelpfully granular for this.
-	total /= 1000000
 	m.unfinishedWorkSeconds.Set(total)
-	m.longestRunningProcessor.Set(oldest / 1000000)
+	m.longestRunningProcessor.Set(oldest)
 }
 
 type noMetrics struct{}
@@ -150,11 +148,6 @@ func (noMetrics) get(item t)            {}
 func (noMetrics) done(item t)           {}
 func (noMetrics) updateUnfinishedWork() {}
 
-// Gets the time since the specified start in microseconds.
-func (m *defaultQueueMetrics) sinceInMicroseconds(start time.Time) float64 {
-	return float64(m.clock.Since(start).Nanoseconds() / time.Microsecond.Nanoseconds())
-}
-
 // Gets the time since the specified start in seconds.
 func (m *defaultQueueMetrics) sinceInSeconds(start time.Time) float64 {
 	return m.clock.Since(start).Seconds()