[SQL]redundant methods for broadcast

redundant methods for broadcast in ```TableReader```

Author: wangfei <wangfei1@huawei.com>

Closes #2862 from scwf/TableReader and squashes the following commits:

414cc24 [wangfei] unnecessary methods for broadcast

sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala

@@ -67,10 +67,6 @@ class HadoopTableReader(
   private val _broadcastedHiveConf =
     sc.sparkContext.broadcast(new SerializableWritable(hiveExtraConf))
 
-  def broadcastedHiveConf = _broadcastedHiveConf
-
-  def hiveConf = _broadcastedHiveConf.value.value
-
   override def makeRDDForTable(hiveTable: HiveTable): RDD[Row] =
     makeRDDForTable(
       hiveTable,