Use TRUNCATE for PostgreSQLManager
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                 Key: SQOOP-387
                 URL: https://issues.apache.org/jira/browse/SQOOP-387
             Project: Sqoop
          Issue Type: Improvement
          Components: connectors/postgresql
            Reporter: Shinichi Yamashita


PostgreSQLManager uses "DELETE" sentence for procesing in staging-table.
When it does "EXPORT" many times, the processing time is prolonged in "DELETE".
Therefore replace it with "TRUNCATE" sentence and improve performance.

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