Redesign of QuorumCnxManager

                 Key: ZOOKEEPER-901
             Project: Zookeeper
          Issue Type: Improvement
          Components: leaderElection
    Affects Versions: 3.3.1
            Reporter: Flavio Junqueira
            Assignee: Flavio Junqueira
             Fix For: 3.4.0

QuorumCnxManager manages TCP connections between ZooKeeper servers for leader 
election in replicated mode. We have identified over time a couple of 
deficiencies that we would like to fix. Unfortunately, fixing these issues 
requires a little more than just generating a couple of small patches. More 
specifically, I propose, based on previous discussions with the community, that 
we reimplement QuorumCnxManager so that we achieve the following:

# Establishing connections should not be a blocking operation, and perhaps even 
more important, it shouldn't prevent the establishment of connections with 
other servers;
# Using a pair of threads per connection is a little messy, and we have seen 
issues over time due to the creation and destruction of such threads. A more 
reasonable approach is to have a single thread and a selector.  

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