This patch looks for Daniel's kernel patch allowing the lxc monitor
to tell container reboot from shutdown based on the exit signal.  If
that patch is not there, utmp monitoring is used.  Otherwise, it only
looks for the signal.  Note that the 'conf->need_utmp_watch' is
technically not necessary, as there is no harm in watching the utmp
file.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>