Add cgroup-lite because lxc,docker don't depend on it

```
$ apt-cache depends lxc
lxc
  Depends on: adduser
  Depends on: apparmor
  Depends on: bridge-utils
    bridge-utils:i386
  Depends on: dnsmasq-base
  Depends on: iptables
  Depends on: liblxc0
  Depends on: python3
  Depends on: python3-lxc
  Depends on: rsync
    rsync:i386
 |Depends on: sysv-rc
  Depends on: <file-rc>
  Depends on: libc6
  Recommends: btrfs-tools
  Recommends: lvm2
    lvm2:i386
  Recommends: lxctl
 |Recommends: cgroup-lite
  Recommends: cgroup-bin
  Recommends: libcap2-bin
  Recommends: lxc-templates
  Recommends: openssl
```

Docker-DCO-1.0-Signed-off-by: Janez Troha <dz0ny@ubuntu.si> (github: dz0ny)