Can't run a container with root bind mounted in F23 docker 1.7

[Dusty Mabe]

docker 1.7 is what is in the stable f23 repo. with that we can't run a 
container with root bind mounted into it:

```
-bash-4.3# docker run -it --rm -v /:/host busybox
Error response from daemon: Relabeling of / is not allowed
-bash-4.3# rpm -q docker
docker-1.7.0-22.gitdcff4e1.fc23.x86_64
```

I guess we'll just have to go with it..

Dusty