Remove full package name for FlatMapOperatorBase

Simple code cleanup to remove full package name for FlatMapOperatorBase for FlatMapOperator#translateToDataFlow method

Author: Henry Saputra <hsaputra@apache.org>

Closes #272 from hsaputra/remove_packagepath_flatmapoperatorbase and squashes the following commits:

8ce5abd [Henry Saputra] Remove full package name for FlatMapOperatorBase for FlatMapOperator#translateToDataFlow method.

flink-java/src/main/java/org/apache/flink/api/java/operators/FlatMapOperator.java

@@ -47,8 +47,7 @@ public class FlatMapOperator<IN, OUT> extends SingleInputUdfOperator<IN, OUT, Fl
 	}
 	
 	@Override
-	protected org.apache.flink.api.common.operators.base.FlatMapOperatorBase<IN, OUT, FlatMapFunction<IN,OUT>> translateToDataFlow(Operator<IN> input) {
-		
+	protected FlatMapOperatorBase<IN, OUT, FlatMapFunction<IN,OUT>> translateToDataFlow(Operator<IN> input) {
 		String name = getName() != null ? getName() : "FlatMap at "+defaultName;
 		// create operator
 		FlatMapOperatorBase<IN, OUT, FlatMapFunction<IN, OUT>> po = new FlatMapOperatorBase<IN, OUT, FlatMapFunction<IN, OUT>>(function, new UnaryOperatorInformation<IN, OUT>(getInputType(), getResultType()), name);