The LXD project has announced that LXD 2.0 is now released. This is an LTS release and is the first product release of the technology. LXD 2.0 will be included in Ubuntu 16.04 and will be backported to 14.04 and it is expected to be picked up by other Linux distros shortly.
I really wish Red Hat would do more with LXC. It sucks that you have to use Ubuntu to get the cool features like this.
If you look at the documentation for RHEL Atomic they have you use docker by attaching and using a shell in the container. Why do that incorrectly when you have Linux containers to do that?
Hopefully in RHEL 8 you won't need EPEL to get LXC functionality.