vendor: update docker cadvisor winterm

This vendor change was purely for the changes in docker to allow for
setting the Masked and Read-only paths.

See: moby/moby#36644

But because of the docker dep update it also needed cadvisor to be
updated and winterm due to changes in pkg/tlsconfig in docker

See: google/cadvisor#1967

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/google/cadvisor/accelerators/nvidia.go

@@ -31,10 +31,7 @@ import (
 )
 
 type NvidiaManager struct {
-	sync.Mutex
-
-	// true if there are NVIDIA devices present on the node
-	devicesPresent bool
+	sync.RWMutex
 
 	// true if the NVML library (libnvidia-ml.so.1) was loaded successfully
 	nvmlInitialized bool
@@ -54,9 +51,20 @@ func (nm *NvidiaManager) Setup() {
 		return
 	}
 
-	nm.devicesPresent = true
-
-	initializeNVML(nm)
+	nm.initializeNVML()
+	if nm.nvmlInitialized {
+		return
+	}
+	go func() {
+		glog.V(2).Info("Starting goroutine to initialize NVML")
+		// TODO: use globalHousekeepingInterval
+		for range time.Tick(time.Minute) {
+			nm.initializeNVML()
+			if nm.nvmlInitialized {
+				return
+			}
+		}
+	}()
 }
 
 // detectDevices returns true if a device with given pci id is present on the node.
@@ -83,18 +91,20 @@ func detectDevices(vendorId string) bool {
 }
 
 // initializeNVML initializes the NVML library and sets up the nvmlDevices map.
-// This is defined as a variable to help in testing.
-var initializeNVML = func(nm *NvidiaManager) {
+func (nm *NvidiaManager) initializeNVML() {
 	if err := gonvml.Initialize(); err != nil {
 		// This is under a logging level because otherwise we may cause
 		// log spam if the drivers/nvml is not installed on the system.
 		glog.V(4).Infof("Could not initialize NVML: %v", err)
 		return
 	}
-	nm.nvmlInitialized = true
 	numDevices, err := gonvml.DeviceCount()
 	if err != nil {
 		glog.Warningf("GPU metrics would not be available. Failed to get the number of nvidia devices: %v", err)
+		nm.Lock()
+		// Even though we won't have GPU metrics, the library was initialized and should be shutdown when exiting.
+		nm.nvmlInitialized = true
+		nm.Unlock()
 		return
 	}
 	glog.V(1).Infof("NVML initialized. Number of nvidia devices: %v", numDevices)
@@ -112,6 +122,10 @@ var initializeNVML = func(nm *NvidiaManager) {
 		}
 		nm.nvidiaDevices[int(minorNumber)] = device
 	}
+	nm.Lock()
+	// Doing this at the end to avoid race in accessing nvidiaDevices in GetCollector.
+	nm.nvmlInitialized = true
+	nm.Unlock()
 }
 
 // Destroy shuts down NVML.
@@ -125,21 +139,12 @@ func (nm *NvidiaManager) Destroy() {
 // present in the devices.list file in the given devicesCgroupPath.
 func (nm *NvidiaManager) GetCollector(devicesCgroupPath string) (AcceleratorCollector, error) {
 	nc := &NvidiaCollector{}
-
-	if !nm.devicesPresent {
-		return nc, nil
-	}
-	// Makes sure that we don't call initializeNVML() concurrently and
-	// that we only call initializeNVML() when it's not initialized.
-	nm.Lock()
-	if !nm.nvmlInitialized {
-		initializeNVML(nm)
-	}
+	nm.RLock()
 	if !nm.nvmlInitialized || len(nm.nvidiaDevices) == 0 {
-		nm.Unlock()
+		nm.RUnlock()
 		return nc, nil
 	}
-	nm.Unlock()
+	nm.RUnlock()
 	nvidiaMinorNumbers, err := parseDevicesCgroup(devicesCgroupPath)
 	if err != nil {
 		return nc, err