Fix paths in the lxc-busybox template

Fix paths in the lxc-busybox template

Author of the patch : Jonathan Liu <???> posted as a bug fix on the lxc
sourceforge website.

OS: Arch Linux 32-bit

/etc/init.d/rcS do not use full path to syslogd, mount and udhcpc executables.
As busybox requires /proc mounted if CONFIG_BUSYBOX_EXEC_PATH="/proc/self/exe"
to run these commands without full path, the full path should be used in the
startup script as /proc is mounted later in the script.

It also fails to start the machine if /lib64 does not exist on the host system
as there is a mount entry for /lib64 in the config.

The attached patch changes commands in /etc/init.d/rcS to use full path and
adds a check for /lib64 on host before adding lib64 mount entries to config.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>