Connection imbalance leads to overloaded ZK instances

                 Key: ZOOKEEPER-856
             Project: Zookeeper
          Issue Type: Bug
            Reporter: Travis Crawford

We've experienced a number of issues lately where "ruok" requests would take 
upwards of 10 seconds to return, and ZooKeeper instances were extremely 
sluggish. The sluggish instance requires a restart to make it responsive again.

I believe the issue is connections are very imbalanced, leading to certain 
instances having many thousands of connections, while other instances are 
largely idle.

A potential solution is periodically disconnecting/reconnecting to balance 
connections over time; this seems fine because sessions should not be affected, 
and therefore ephemaral nodes and watches should not be affected.

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