doc: Update Japanese lxc-stop(1), lxc.conf(5), lxc-start-ephemeral(1)

* nokill option of lxc-stop (commit 84fbfcb434f5a59680b7f017bbc1d0db0b81a39d)
* lxc.haltsignal in lxc.conf (commit f0f1d8c076ae93d8ecf735c2eeae471e27ca6abd)
* fix sgml (commit d438f5a0ef0f304917e227405d26aef6e7b30303)

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>