pkg/various: plug leaky time.New{Timer,Ticker}s

According to the documentation for Go package time, `time.Ticker` and
`time.Timer` are uncollectable by garbage collector finalizers.  They
leak until otherwise stopped.  This commit ensures that all remaining
instances are stopped upon departure from their relative scopes.

pkg/controller/volume/persistentvolume/framework_test.go

@@ -363,6 +363,7 @@ func checkEvents(t *testing.T, expectedEvents []string, ctrl *PersistentVolumeCo
 	// Read recorded events - wait up to 1 minute to get all the expected ones
 	// (just in case some goroutines are slower with writing)
 	timer := time.NewTimer(time.Minute)
+	defer timer.Stop()
 
 	fakeRecorder := ctrl.eventRecorder.(*record.FakeRecorder)
 	gotEvents := []string{}

pkg/kubelet/kubelet.go

@@ -2072,7 +2072,9 @@ func (kl *Kubelet) syncLoop(updates <-chan kubetypes.PodUpdate, handler SyncHand
 	// that need to be sync'd. A one-second period is sufficient because the
 	// sync interval is defaulted to 10s.
 	syncTicker := time.NewTicker(time.Second)
+	defer syncTicker.Stop()
 	housekeepingTicker := time.NewTicker(housekeepingPeriod)
+	defer housekeepingTicker.Stop()
 	plegCh := kl.pleg.Watch()
 	for {
 		if rs := kl.runtimeState.errors(); len(rs) != 0 {

pkg/kubelet/server/remotecommand/httpstream.go

@@ -184,6 +184,7 @@ func createHttpStreamStreams(req *http.Request, w http.ResponseWriter, opts *opt
 	}
 
 	expired := time.NewTimer(streamCreationTimeout)
+	defer expired.Stop()
 
 	ctx, err := handler.waitForStreams(streamCh, opts.expectedStreams, expired.C)
 	if err != nil {

pkg/util/goroutinemap/goroutinemap_test.go

@@ -484,6 +484,7 @@ func retryWithExponentialBackOff(initialDuration time.Duration, fn wait.Conditio
 
 func waitChannelWithTimeout(ch <-chan interface{}, timeout time.Duration) error {
 	timer := time.NewTimer(timeout)
+	defer timer.Stop()
 
 	select {
 	case <-ch:

pkg/util/httpstream/spdy/connection_test.go

@@ -146,6 +146,7 @@ func TestConnectionCloseIsImmediateThroughAProxy(t *testing.T) {
 	}
 
 	expired := time.NewTimer(15 * time.Second)
+	defer expired.Stop()
 	i := 0
 	for {
 		select {

pkg/volume/util/nestedpendingoperations/nestedpendingoperations_test.go

@@ -558,6 +558,7 @@ func retryWithExponentialBackOff(initialDuration time.Duration, fn wait.Conditio
 
 func waitChannelWithTimeout(ch <-chan interface{}, timeout time.Duration) error {
 	timer := time.NewTimer(timeout)
+	defer timer.Stop()
 
 	select {
 	case <-ch: