Explore writng a specialized summarizer for bulk ingest

To debug a recent bulk ingest test I wrote the following summarizer. This summarizer counted the number of times each UUID was seen. I used to count the number of entries each map reduce job had created.

```java
package test.ci;

import org.apache.accumulo.core.client.summary.CountingSummarizer;

public class CiUuidSummarizer extends CountingSummarizer{

@Override
protected Converter converter() {
return (k,v,c) -> c.accept(v.toString().split(":")[0]);
}

}

```