Last processed zxid set prematurely while establishing leadership

                 Key: ZOOKEEPER-790
             Project: Zookeeper
          Issue Type: Bug
          Components: quorum
    Affects Versions: 3.3.1
            Reporter: Flavio Paiva Junqueira
             Fix For: 3.3.2
         Attachments: ZOOKEEPER-790.patch

The leader code is setting the last processed zxid to the first of the new 
epoch even before connecting to a quorum of followers. Because the leader code 
sets this value before connecting to a quorum of followers ( 
and the follower code throws an IOException ( if the leader 
epoch is smaller, we have that when the false leader drops leadership and 
becomes a follower, it finds a smaller epoch and kills itself.

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