updated cadvisor deps

vendor/github.com/google/cadvisor/container/docker/factory.go

@@ -57,6 +57,12 @@ var (
 	dockerRootDirFlag = flag.String("docker_root", "/var/lib/docker", "DEPRECATED: docker root is read from docker info (this is a fallback, default: /var/lib/docker)")
 
 	dockerRootDirOnce sync.Once
+
+	// flag that controls globally disabling thin_ls pending future enhancements.
+	// in production, it has been found that thin_ls makes excessive use of iops.
+	// in an iops restricted environment, usage of thin_ls must be controlled via blkio.
+	// pending that enhancement, disable its usage.
+	disableThinLs = true
 )
 
 func RootDir() string {
@@ -189,6 +195,10 @@ func startThinPoolWatcher(dockerInfo *dockertypes.Info) (*devicemapper.ThinPoolW
 		return nil, err
 	}
 
+	if disableThinLs {
+		return nil, fmt.Errorf("usage of thin_ls is disabled to preserve iops")
+	}
+
 	dockerThinPoolName, err := dockerutil.DockerThinPoolName(*dockerInfo)
 	if err != nil {
 		return nil, err

vendor/github.com/google/cadvisor/container/docker/handler.go

@@ -252,9 +252,11 @@ func newDockerContainerHandler(
 	// split env vars to get metadata map.
 	for _, exposedEnv := range metadataEnvs {
 		for _, envVar := range ctnr.Config.Env {
-			splits := strings.SplitN(envVar, "=", 2)
-			if splits[0] == exposedEnv {
-				handler.envs[strings.ToLower(exposedEnv)] = splits[1]
+			if envVar != "" {
+				splits := strings.SplitN(envVar, "=", 2)
+				if len(splits) == 2 && splits[0] == exposedEnv {
+					handler.envs[strings.ToLower(exposedEnv)] = splits[1]
+				}
 			}
 		}
 	}