Leader can treat observers as quorum members

                 Key: ZOOKEEPER-769
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-769
             Project: Zookeeper
          Issue Type: Bug
    Affects Versions: 3.3.0
         Environment: Ubuntu Karmic x64
            Reporter: Sergey Doroshenko
             Fix For: 3.3.0

In short: it seems leader can treat observers as quorum members.

Steps to repro:

1. Server configuration: 3 voters, 2 observers (attached).
2. Bring up 2 voters and one observer. It's enough for quorum.
3. Shut down the one from the quorum who is the follower.

As I understand, expected result is that leader will start a new election round 
so that to regain quorum.
But the real situation is that it just says goodbye to that follower, and is 
still operable. (When I'm shutting down 3rd one -- observer -- leader starts 
trying to regain a quorum).

(Expectedly, if on step 3 we shut down the leader, not the follower, remaining 
follower starta new leader election, as it should be).

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