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/processstarttime.go

@@ -20,29 +20,24 @@ import (
 	"os"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/procfs"
 
 	"k8s.io/klog"
 )
 
-var processStartTime = prometheus.NewGaugeVec(
-	prometheus.GaugeOpts{
-		Name: "process_start_time_seconds",
-		Help: "Start time of the process since unix epoch in seconds.",
+var processStartTime = NewGaugeVec(
+	&GaugeOpts{
+		Name:           "process_start_time_seconds",
+		Help:           "Start time of the process since unix epoch in seconds.",
+		StabilityLevel: ALPHA,
 	},
 	[]string{},
 )
 
-// Registerer is an interface expected by RegisterProcessStartTime in order to register the metric
-type Registerer interface {
-	Register(prometheus.Collector) error
-}
-
 // RegisterProcessStartTime registers the process_start_time_seconds to
 // a prometheus registry. This metric needs to be included to ensure counter
 // data fidelity.
-func RegisterProcessStartTime(registrationFunc func(prometheus.Collector) error) error {
+func RegisterProcessStartTime(registrationFunc func(Registerable) error) error {
 	start, err := getProcessStart()
 	if err != nil {
 		klog.Errorf("Could not get process start time, %v", err)