[FLINK-29345] Create reusing reader/writer config in orc format #309
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Currently OrcFileFormat will create new org.apache.hadoop.conf.Configuration instance in methods createReaderFactory and createWriterFactory. The initialization of org.apache.hadoop.conf.Configuration tries to load local file core-site.xml.
This PR will initialize the writerConf and readerConf of org.apache.hadoop.conf.Configuration and reuse them in createReaderFactory and createWriterFactory.