BUG-19608: (PIG-4044, PIG-4045) Pig job processing Avro fails because avro-mapred-h2.jar is not included in pig-withouthadoop.jar
Problem: If Pig was installed from pig-withouthadoop.jar (which is missing avro-mapred-h2.jar), trying to run Pig with Avro data returns:
Error running child : java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected
