Registration of the docker container factory failed after update to v0.54.1

After updating from v0.54.0 to v.54.1 the docker container factory fails.

## v0.54.0

```
cadvisor-1 | I1207 18:29:25.894956 1 factory.go:221] Registration of the containerd container factory failed: unable to create containerd client: containerd: cannot unix dial containerd api service: dial unix /run/containerd/containerd.sock: connect: no such file or directory
cadvisor-1 | I1207 18:29:25.909764 1 factory.go:361] Registering Docker factory
cadvisor-1 | I1207 18:29:25.909796 1 factory.go:223] Registration of the docker container factory successfully
```

## v0.54.1

```
cadvisor-1 | I1207 19:09:33.791068 1 factory.go:221] Registration of the containerd container factory failed: unable to create containerd client: containerd: cannot unix dial containerd api service: dial unix /run/containerd/containerd.sock: connect: no such file or directory
cadvisor-1 | I1207 19:09:33.807339 1 factory.go:221] Registration of the docker container factory failed: unable to create containerd client: containerd: cannot unix dial containerd api service: dial unix /run/containerd/containerd.sock: connect: no such file or directory
```

The error message for the failed docker container factory equals the containerd container factory.