lxclock_name will fallback to /tmp/$(id -u)/lxc$lxcpath/.$lxcname when failed
to create directories into rundir. But, in currently, lxclock_name returns
untill preparing directories under the /tmp, so invoker will fail to get
the container lock.  This patch fixes fixes this.
Signed-off-by: Kohei YOSHIDA <kohei.yoshida@gehirn.co.jp>