Add lastMessageSent to QuorumCnxManager

                 Key: ZOOKEEPER-481
             Project: Zookeeper
          Issue Type: Bug
          Components: leaderElection
            Reporter: Flavio Paiva Junqueira
         Attachments: ZOOKEEPER-481.patch

Currently we rely on TCP for reliable delivery of FLE messages. However, as we 
concurrently drop and create new connections, it is possible that a message is 
sent but never received. With this patch, cnx manager keeps a list of last 
messages sent, and resends the last one sent. Receiving multiples copies is 

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