clean up UGI to support savetoConf
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                 Key: HADOOP-4055
                 URL: https://issues.apache.org/jira/browse/HADOOP-4055
             Project: Hadoop Core
          Issue Type: Improvement
          Components: util
            Reporter: Owen O'Malley


Currently clients have to use UnixUserGroupInfo instead of UserGroupInfo 
because saveToConf is only defined in UnixUGI. We should add the abstract 
saveToConf in UGI.

{code}
UserGroupInfo:
  public abstract void saveToConf(Configuration conf);
{code}

and the matching body in UnixUGI.

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