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>

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

docs/reference/commandline/daemon.md

@@ -439,11 +439,6 @@ Currently supported options of `zfs`:
 The Docker daemon uses a specifically built `libcontainer` execution driver as
 its interface to the Linux kernel `namespaces`, `cgroups`, and `SELinux`.
 
-There is still legacy support for the original [LXC userspace tools](
-https://linuxcontainers.org/) via the `lxc` execution driver, however, this is
-not where the primary development of new functionality is taking place.
-Add `-e lxc` to the daemon flags to use the `lxc` execution driver.
-
 ## Options for the native execdriver
 
 You can configure the `native` (libcontainer) execdriver using options specified

docs/reference/commandline/run.md

@@ -47,7 +47,6 @@ parent = "smn_cli"
       --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