NPE in ZooKeeperManager if base directory cannot be created

                 Key: GIRAPH-30
             Project: Giraph
          Issue Type: Bug
            Reporter: Andrew Purtell
            Priority: Minor

If the base directory cannot be created, for example if running on secure 
Hadoop and the user home directory does not exist, ZooKeeperManager will throw 
an NPE when trying to list it. It would be better to throw an IOException with 
an informative message.

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