Check that election port is present for all servers

                 Key: ZOOKEEPER-188
             Project: Zookeeper
          Issue Type: Improvement
    Affects Versions: 3.0.0
            Reporter: Flavio Paiva Junqueira
             Fix For: 3.0.0

Currently, if we use the default leader election, but we do not provide an 
election port for every server, then zookeeper servers simply crash. I'm 
attaching a patch to output an error message warning the user of the 
configuration problem. It might be a better idea to through an exception upon 
fatal configuration problems, but QuorumPeerConfig.parse() currently throws no 
exception, so we might postpone such a change  until after the 3.0.0 release.

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