debian: Symlink /etc/mtab
debian: Symlink /etc/mtab

/etc/mtab doesn’t exist after bootstrapping a debian container, and will
be created as regular file after first start.

That leads to at least two errors:
- output of `mount` is wrong and get messed up the more often you
  start/stop the container
- /dev/pts/ptmx has wrong permissions

Signed-off-by: Holger Amann <f2dd0367ce064e03148d3b722c10cf0a59d01e6e@sauspiel.de>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

ojkastl/lxc_Patches,ojkastl/lxc_Patches,ojkastl/lxc_Patches,ojkastl/lxc_Patches