Old leader election can elect a dead leader over and over again

                 Key: ZOOKEEPER-131
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-131
             Project: Zookeeper
          Issue Type: Bug
          Components: leaderElection
            Reporter: Benjamin Reed

I think there is a race condition that is probably easy to get into with the 
old leader election and a large number of servers:

1) Leader dies
2) Followers start looking for a new leader before all Followers have abandoned 
the Leader
3) The Followers looking for a new leader see votes of Followers still 
following the (now dead) Leader and start voting for the dead Leader
4) The dead Leader gets reelected.

For the old leader election a server should not vote for another server that is 
not nominating himself.

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