FLE should perform leader check when node is not leading and add vote of 

                 Key: ZOOKEEPER-480
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-480
             Project: Zookeeper
          Issue Type: Bug
            Reporter: Flavio Paiva Junqueira
             Fix For: 3.2.1

As a server may join leader election while others have already elected a 
leader, it is necessary that a server handles some special cases of leader 
election when notifications are from servers that are either LEADING or 
FOLLOWING. In such special cases, we check if we have received a message from 
the leader to declare a leader elected. This check does not consider the case 
that the process performing the check might be a recently elected leader, and 
consequently the check fails.

This patch also adds a new case, which corresponds to adding a vote to recvset 
when the notification is from a process LEADING or FOLLOWING. This fixes the 
case raised in ZOOKEEPER-475.

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