The current version of lxc-checkconfig falls back to searching in
/lib/modules/$KVER/build/.config if it doesn't find the config. In some
systems, though, the config will be installed in /boot/config-$KVER, so
we'll look there as well.
Signed-off-by: Guido Trotter <ultrotter@quaqua.net>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>