Update deps to Kube 1.11.3

This updates the dependencies to Kube 1.11.3 to pull in a fix allowing
requestheader auth to be used without normal client auth (which makes
things work on clusters that don't enable client auth normally, like
EKS).

vendor/github.com/coreos/etcd/clientv3/lease.go

@@ -77,8 +77,6 @@ const (
 	// defaultTTL is the assumed lease TTL used for the first keepalive
 	// deadline before the actual TTL is known to the client.
 	defaultTTL = 5 * time.Second
-	// a small buffer to store unsent lease responses.
-	leaseResponseChSize = 16
 	// NoLease is a lease ID for the absence of a lease.
 	NoLease LeaseID = 0
 
@@ -86,6 +84,11 @@ const (
 	retryConnWait = 500 * time.Millisecond
 )
 
+// LeaseResponseChSize is the size of buffer to store unsent lease responses.
+// WARNING: DO NOT UPDATE.
+// Only for testing purposes.
+var LeaseResponseChSize = 16
+
 // ErrKeepAliveHalted is returned if client keep alive loop halts with an unexpected error.
 //
 // This usually means that automatic lease renewal via KeepAlive is broken, but KeepAliveOnce will still work as expected.
@@ -258,7 +261,7 @@ func (l *lessor) Leases(ctx context.Context) (*LeaseLeasesResponse, error) {
 }
 
 func (l *lessor) KeepAlive(ctx context.Context, id LeaseID) (<-chan *LeaseKeepAliveResponse, error) {
-	ch := make(chan *LeaseKeepAliveResponse, leaseResponseChSize)
+	ch := make(chan *LeaseKeepAliveResponse, LeaseResponseChSize)
 
 	l.mu.Lock()
 	// ensure that recvKeepAliveLoop is still running
@@ -514,9 +517,10 @@ func (l *lessor) recvKeepAlive(resp *pb.LeaseKeepAliveResponse) {
 	for _, ch := range ka.chs {
 		select {
 		case ch <- karesp:
-			ka.nextKeepAlive = nextKeepAlive
 		default:
 		}
+		// still advance in order to rate-limit keep-alive sends
+		ka.nextKeepAlive = nextKeepAlive
 	}
 }