2.2.0.M3

Change log:

9fae369 Upgrade to SF 5.1.0.RC3
2b78b42 GH-800: Fix Zombie Fencing
76f7ed7 Fix @SInCE tag for setRemoveTypeHeaders()
7beaa60 GH-794: Json Deserializer - remove type headers
9f828a8 Doc: Partition Assignment
e16ae4f SeekToCurrentErrorHandler and Recovery
9997ffd Refactor KafkaAwareTransactionManager
b3f3894 Add ISSUE_TEMPLATE.md
1247ee1 GH-786: DKPF: ContextStoppedEvent