Follow updates of configuration keys:
* Delete lxc.kmsg (commit 26a38fb6)
* lxc.console -> lxc.console.path (commit 3aed4934)
* lxc.mount -> lxc.mount.fstab (commit 47148e96)
* lxc.net.ipv{4,6} -> lxc.net.ipv{4,6}.address (commit 9ff60df2, 2e44ae28)
* lxc.tty -> lxc.tty.max, lxc.devttydir -> lxc.tty.dir (commit fe1c5887)
* lxc.pts -> lxc.pty.max (commit 232763)
Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>