- remove junit4 dependecies
- refactor the unit tests by junit5
- enhance the spring-statemachine-test and spring-statemachine-build-tests so they can work together with junit4/junit5
- relates #779
- New module spring-statemachine-cluster which is
based on spring-cloud-cluster to provide leader
election.
- Ensemble now has a concept of a leader if implementation
supports it.
- New DistributedLeaderAction can use leader info to execute
action only on a leader.
- Tweak web sample with these new concepts.
- Fixes#176