server-tools/instance-manager/guardian.cc:
  Removed erroneous unlock() in Guardian_thread::init():
  instance_map is unlocked in the caller.
server-tools/instance-manager/instance_map.cc:
  Added TODO comment.
server-tools/instance-manager/manager.cc:
  Make initialization of alarm infrustructure before starting Guardian
  thread, because Guardian uses thr_alarm().