AVRO-3092: Update ubertool image to buster (#1155)
AVRO-3092: Update ubertool image to buster (#1155)

This requires installing the JDK8 from another repository.  In this case
AdoptOpenJDK.
apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro,apache/avro