[I] [Java] UnionListWriter does not behave properly when multiple lists are written in the same list [arrow-java]

[via GitHub]

asfimport opened a new issue, #296:
URL: https://github.com/apache/arrow-java/issues/296

   if you run the following code:
   ```Java
       ListVector listVector = new ListVector("list", allocator, null);
       listVector.allocateNew();
       UnionListWriter listWriter = new UnionListWriter(listVector);
   
       listWriter.start();
       listWriter.startList();
   
       listWriter.list("a").startList();
       listWriter.list("a").bigInt().writeBigInt(1);
       listWriter.list("a").bigInt().writeBigInt(2);
       listWriter.list("a").bigInt().writeBigInt(3);
       listWriter.list("a").endList();
   
       listWriter.list("a").startList();
       listWriter.list("a").bigInt().writeBigInt(4);
       listWriter.list("a").bigInt().writeBigInt(5);
       listWriter.list("a").endList();
   
       listWriter.endList();
       listWriter.end();
   
       listWriter.setValueCount(1);
   ```
   
   listVector will contain:
   ```
   [{"a":[1,2,3,4,5]}]
   ```
   Instead of
   ```
   [{"a":[1,2,3],[4,5]}]
   ```
   
   **Reporter**: [Abdel Hakim 
Deneche](https://issues.apache.org/jira/browse/ARROW-307) / @adeneche
   
   <sub>**Note**: *This issue was originally created as 
[ARROW-307](https://issues.apache.org/jira/browse/ARROW-307). Please see the 
[migration documentation](https://github.com/apache/arrow/issues/14542) for 
further details.*</sub>


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