Using libcontainer on LXC
That isn't surprising when you see pull request like PR 17700:
Remove LXC support
The LXC driver was deprecated in Docker 1.8.
Following the deprecation rules, we can remove a deprecated featureafter two major releases.
LXC won't be supported anymore starting on Docker 1.10.
As I mentioned in "Difference between LXC and libcontainer", libcontainer (or runc now) is supposed to replace and abstract LXC. So "running libcontainer on lxc" doesn't seem to make sense.
Docker 1.10 has removed support for the LXC execution driver. That doesn't mean that you can't use Docker 1.10 inside of an LXC -- you definitely can.