explain session expiration better in the docs & faq

                 Key: ZOOKEEPER-688
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-688
             Project: Zookeeper
          Issue Type: Bug
          Components: documentation
            Reporter: Patrick Hunt
            Assignee: Benjamin Reed
            Priority: Critical
             Fix For: 3.3.0

We are not clear enough (and the diagram we do have seems misleading) on _when_ 
session expirations are generated. In particular the fact that you only get 
expirations when the client is connected to the cluster, not when disconnected.

we need to detail:

1) when do you get expiration
2) what is the sequence of events that the watcher sees, from disco state, to 
getting the expiration (say the expiration happens when the client is disco, 
what do you see in the watcher while you are getting reconnected)
3) we need to give some examples of how to test this. We should be explicit 
that "pulling the network cable" on the client will not show expiration since 
the cliient will not be reconnected.

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