the java shell should indicate connection status on command prompt

                 Key: ZOOKEEPER-434
             Project: Zookeeper
          Issue Type: Improvement
          Components: java client
    Affects Versions: 3.2.0
            Reporter: Patrick Hunt
            Assignee: Henry Robinson
            Priority: Minor

it would be very useful if the java shell showed the current connection status 
as part of the command prompt.

this shows itself in particular for the following use case:

I attempted to connect a java shell to a remote cluster that was unavailable, 
when I run the first command "ls /" on
the cluster the shell hangs. It would be nice if the shell indicated connection 
status in the prompt and make it more
clear that the shell is currently not connected. (it was hard to see the 
"attempting to connect" console message as
it was lost in with the other messaes...)

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