vendor: cadvisor v0.39.0

Main upgrades:
- github.com/opencontainers/runc v1.0.0-rc93
- github.com/containerd/containerd v1.4.4
- github.com/docker/docker v20.10.2
- github.com/mrunalp/fileutils v0.5.0
- github.com/opencontainers/selinux v1.8.0
- github.com/cilium/ebpf v0.2.0

vendor/github.com/cilium/ebpf/doc.go

@@ -12,6 +12,5 @@
 // eBPF code should be compiled ahead of time using clang, and shipped with
 // your application as any other resource.
 //
-// This package doesn't include code required to attach eBPF to Linux
-// subsystems, since this varies per subsystem.
+// Use the link subpackage to attach a loaded program to a hook in the kernel.
 package ebpf