C client's zoo_state function returns unknown state 0

                 Key: ZOOKEEPER-553
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-553
             Project: Zookeeper
          Issue Type: Bug
          Components: c client, contrib-bindings
    Affects Versions: 3.2.1
            Reporter: Steven Wong

Using zkpython with ZK 3.2.1 release:

import zookeeper as z
zh = z.init(...)
z.state(zh)  # returns 3 == z.CONNECTED_STATE
# kill standalone ZK server
z.state(zh)  # returns 0 == ???

The problem is that 0 is not a state defined by the C client's zookeeper.[ch]. 
Perhaps 0 should've been defined as something like DISCONNECTED_STATE? (Java's 
KeeperState.Disconnected is 0, if that matters.)

If the fix is to define 0 as a new state, changes will be needed to both the C 
client and zkpython. Not sure about other bindings.

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