#2150 amfd: standby amfd crash while decoding node info during cold sync period

[Long H Buu Nguyen]

• Description:
  When standby cold sync occurs, there may have a chance that
  node creation information is missed in standby node. Active node sending
  node information to standby node (checkpointing) will lead to a standby amfd crash.
  One way to get over this situation is to create node when the node is null.

• Reproduction:
  1) Start a cluster (e.g. 5 nodes).
  2) On Standby controller, add a sleep (e.g. 5 seconds) to main.cc:
  3) Reboot standby controller.
  4) Use the script scale_opensaf in python/samples directory to add a node (e.g. PL-6) while standby is rebooting.
  5) Observe a coredump on standby node.

[Long H Buu Nguyen]

With the patch of #2112, this issue does not occur.