ISPN-4154 Cancelled segment transfer causes future entry transfer to be ignored

Stop tracking keys when a new coordinator cancels the state transfer.
ISPN-4469 StateConsumerImpl segment change tracing is incorrect
ISPN-4479 Remote executor thread pool configuration is ignored
ISPN-4481 Use UNICAST3 and NAKACK2 in the default server configuration
ISPN-4484 Outbound transfers can be cancelled by old CANCEL_STATE_TRANSFER command