Convert FSImage.removedStorageDirs into a map.
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                 Key: HADOOP-5619
                 URL: https://issues.apache.org/jira/browse/HADOOP-5619
             Project: Hadoop Core
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.21.0
            Reporter: Konstantin Shvachko
             Fix For: 0.21.0


{{FSImage.removedStorageDirs}} is declared as an {{ArrayList}}. In order to 
avoid adding the same directory twice into {{removedStorageDirs}} we should 
convert it into a map.

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