RF Group Leader Election - GROUPIES and HELLOs

[notes]

Initially, every controller assumes that it is the RF group leader for its configured RF group.  It creates its unique group ID and adds itself to the group.  After this, the controller sends a HELLO packet to all the controllers it knows about every 10 seconds.

In addition to the HELLO message, the controller colleges neighbor messages from its APs.  These collected neighbor messages