Improvements to FLE

                 Key: ZOOKEEPER-230
             Project: Zookeeper
          Issue Type: Improvement
          Components: leaderElection
    Affects Versions: 3.1.0
            Reporter: Flavio Paiva Junqueira
            Assignee: Flavio Paiva Junqueira
             Fix For: 3.0.0

I'm about to attach a patch that implements the following modifications:

. Currently, if a server is on leader election and doesn't receive a 
notification for some amount of time t, then it sends a new set of 
notifications if at least one server has delivered a message from the previous 
set. With this patch, the amount of time a server waits for a notification 
before sending a new set increases exponentially;
. I have separated connecting to servers and queuing new notification messages. 
Before they were all in the same message. The advantage is that now I can tell 
to an instance of QuorumCnxManager to try to connect to other servers without 
generating new notification messages;
. I have changed the logging level of several messages on QuorumCnxManager. 
They were "warn", but they should really be either "info" or "debug". I've 
changed them to info.

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