doc: change "-t" option of lxc-create(1) to being required

* fix "reg" to "req" in English (fix for commit b8683fe)
* change "opt" to "req" in Japanese

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Remounts bind mounts if read-only flag is provided

Bind mounts do not honor filesystem mount options. This change will
remount filesystems that are bind mounted if there are changes to
filesystem mount options, specifically if the mount is readonly.

Signed-off-by: Abin Shahab <ashahab@altiscale.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>