Server group autofailover has gone away in 7.1.0 and replaced with multi node autofailover

Just realized we didn't release note, MB-33628 and it's consequences.

MB-33628 provides the customer the ability to auto-failover multiple nodes at the same time, at the same time a decision was made to not support server group autofailover, i.e. there is no way to enable server group autofailover now and we ignore setting made prior to 7.1. 

The number of nodes that can be auto-failed over is restricted by the auto-failover count. Prior to 7.1, we restricted this number to 3, which included server group failover(counts as 1 event). To support failing multiple nodes in server group or the entire server group, the auto-failover count restriction has been lifted. Unfortunately, this also means on upgrade customers need to change the auto-failover count to a higher number in order to failover a server group(possibly by the number of nodes in the server group).