ISPN-5040 Upgrade to JGroups 3.6.1.
- Drop DISCARD2
- Use resend_last_seqno="true" in NAKACK2
ISPN-5088 Deleted entries from (FineGrained)AtomicMap reappear in
subsequent transaction
ISPN-5089 Store divisors in a temporary variable to avoid java.lang.ArithmeticException: / by zero
ISPN-5104 Infinite loop in TransactionAwareCloseableIterator when
iterating through cache

Fixed issue where entry was repeated if added to context after
starting a transaction
ISPN-5071 No rebalance enabled and suspended messages logged