Remove LXC support.

The LXC driver was deprecated in Docker 1.8.
Following the deprecation rules, we can remove a deprecated feature
after two major releases. LXC won't be supported anymore starting on Docker 1.10.

Signed-off-by: David Calavera <david.calavera@gmail.com>
Upstream-commit: 3b5fac462d21ca164b3778647420016315289034
Component: engine

components/engine/docs/reference/commandline/create.md

@@ -48,7 +48,6 @@ Creates a new container.
       --link=[]                     Add link to another container
       --log-driver=""               Logging driver for container
       --log-opt=[]                  Log driver specific options
-      --lxc-conf=[]                 Add custom lxc options
       -m, --memory=""               Memory limit
       --mac-address=""              Container MAC address (e.g. 92:d0:c6:0a:29:33)
       --memory-reservation=""       Memory soft limit