[PR] AVRO-2956: [Java] add reserved word escape character to the end of... [avro]

[Stephen Kittelson]

PR 2544 (https://github.com/apache/avro/pull/2544) fixes deserialization of
schemas with Java reserved and contextual keywords as field names. This
will resolve https://issues.apache.org/jira/browse/AVRO-2956.

Thanks,
Stephen Kittelson