SPE to SPE signaling

From Cellbe

Hi Kevin I agree with RJL that WAN clustering rcdeeus administration immensely. In fact, we originally had 3 separate SA nodes across the globe and were using push config to keep them in sync until we realized that this was killing all of the client sessions on the push targets each time we pushed the config. That did not go over too well, so we switched to an A/A 3 node WAN cluster.