Monitor the heartbeat of the cluster controller
Monitor the heartbeat of the cluster controller

Monitor the heartbeat pings from the cluster controller every few
seconds (default = 5sec) and shutdown the engine if too many (default=5)
heartbeats were missing.

Signed-off-by: Jan Schulz <7fb630b19ed7bf3033a3f003af589997c9df045d@gmx.net>

ipython/ipython,ipython/ipython