Issues with FLENewEpochTest

                 Key: ZOOKEEPER-362
             Project: Zookeeper
          Issue Type: Bug
    Affects Versions: 3.1.1
            Reporter: Flavio Paiva Junqueira
             Fix For: 3.2.0

I have been able to identify two reasons that cause FLENewEpochTest to fail:

1- There is a race condition that is triggered when two peers try to establish 
a connection to each other for leader election. Basically, if they start 
roughly at the same time, the server with highest id will try to open two 
connections. The two competing connections will lead to one notification 
message to be lost. This message happens to be critical for this two process 
2- The code to shut down a peer is not working well with the unit tests. For 
this particular unit test, we need to be able to shut down a peer completely to 
check the situation the test tries to reproduce. However, it seems that in some 
runs timing causes the other peers to believe it is still alive, and end up 
electing it. This peer, however, eventually shuts down and leader election 

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