update cAdvisor godeps to v0.34.0 release

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

@@ -30,6 +30,7 @@ import (
 )
 
 var dockerOnly = flag.Bool("docker_only", false, "Only report docker containers in addition to root stats")
+var disableRootCgroupStats = flag.Bool("disable_root_cgroup_stats", false, "Disable collecting root Cgroup stats")
 
 type rawFactory struct {
 	// Factory for machine information.

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

@@ -227,6 +227,9 @@ func (self *rawContainerHandler) getFsStats(stats *info.ContainerStats) error {
 }
 
 func (self *rawContainerHandler) GetStats() (*info.ContainerStats, error) {
+	if *disableRootCgroupStats && isRootCgroup(self.name) {
+		return nil, nil
+	}
 	stats, err := self.libcontainerHandler.GetStats()
 	if err != nil {
 		return stats, err