overlayfs_clonepaths: if unpriv then rsync in a userns

This allows lxc-snapshot and lxc-clone -s from an overlayfs container
to work unprivileged.  (lxc-clone -s from a directory backed container
already did work)

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
doc: Update Japanese man pages for aufs support

Update lxc-clone(1) and lxc-snapshot(1) for commit 1f92162dc0432b6f7f8156d22348f22934cbea3f
and improve some translations

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
doc: Update lxc.container.conf(5)

- Update Japanese man for commit a7c27357b33d726a326a11e1e72f68e1546b994a, seccomp v2
- Fix typo in English man

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