Update backport support in Wheezy for LXC 1.0.5

This patch brings modifications to support LXC 1.0.5 package backported
from Debian Jessie to Debian Wheezy. Ubuntu hosts should be unaffected.

List of changes in the Jessie package can be found at:
http://metadata.ftp-master.debian.org/changelogs/main/l/lxc/testing_changelog