Unnecessary snapshot transfers between new leader and followers

                 Key: ZOOKEEPER-876
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-876
             Project: Zookeeper
          Issue Type: Bug
    Affects Versions: 3.3.1
            Reporter: Diogo
            Priority: Minor

When starting a new leadership, unnecessary snapshot transfers happen between 
new leader and followers. This is so because of multiple small bugs. 

1) the comparison of zxids is done based on a new proposal, instead of the last 
logged zxid. (LearnerFollower.java:310)
2) if follower is one zxid behind, the check of the interval of committed logs 
excludes the follower. (LearnerFollower.java:269)
3) the bug reported in ZOOKEEPER-874 (commitLogs are empty after recover).

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