AlphaCanisMajoris issues

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                                            AlphaCanisMajoris

ZOOKEEPER-4643, ZOOKEEPER-4646 & ZOOKEEPER-4394: Committed txns lost / NullPointerException in Learner.syncWithLeader()

This fix aims to fix a bunch of issues in follower's syncWithLeader(). e.g., [ZOOKEEPER-4394](https://issues.apache.org/jira/browse/ZOOKEEPER-4394): NullPointerException when follower receives COMMIT after replying NEWLEADER ack in syncWithLeader(). Explanation: In syncWithLeader(), a follower...

Committed txns may still be lost if followers crash after replying ACK of NEWLEADER but before writing txns to disk

In brief, committed logs might be lost due to the follower's **asynchronous** transaction logging when replying ACK of NEWLEADER during the SYNC phase. See [ZOOKEEPER-4646](https://issues.apache.org/jira/browse/ZOOKEEPER-4646) for details on the symptom,...