c client can flood server with pings if tcp send queue filled

                 Key: ZOOKEEPER-562
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-562
             Project: Zookeeper
          Issue Type: Bug
          Components: c client
    Affects Versions: 3.2.1
            Reporter: Patrick Hunt
            Assignee: Mahadev konar
            Priority: Blocker
             Fix For: 3.2.2, 3.3.0

The c client can flood the server with pings if the tcp queue is filled.

Say the cluster is overloaded and shuts down the recv processing

a c client can send a ping, but since last_send is only updated on successful 
pushing of data into the 
socket, if flush_send_queue fails to send any data (send_buffer returns 0) then 
last_send is not updated
and zookeeper_interest will again send a ping the next time it is woken - which 
could be 0 if recv_to is close
to 0, easily could happen if server is not sending data to the client.

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