Auto-HA: Allow manual failover to be invoked from zkfc.
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                 Key: HADOOP-8279
                 URL: https://issues.apache.org/jira/browse/HADOOP-8279
             Project: Hadoop Common
          Issue Type: Improvement
          Components: ha
    Affects Versions: Auto Failover (HDFS-3042)
            Reporter: Mingjie Lai
             Fix For: Auto Failover (HDFS-3042)


HADOOP-8247 introduces a configure flag to prevent potential status 
inconsistency between zkfc and namenode, by making auto and manual failover 
mutually exclusive.

However, as described in 2.7.2 section of design doc at HDFS-2185, we should 
allow manual and auto failover co-exist, by:
- adding some rpc interfaces at zkfc
- manual failover shall be triggered by haadmin, and handled by zkfc if auto 
failover is enabled. 


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