Revert Avro version upgrade (code not compatible with 1.9+)

Author: cowtowncoder

avro/pom.xml

@@ -47,7 +47,7 @@ abstractions.
     <dependency>
       <groupId>org.apache.avro</groupId>
       <artifactId>avro</artifactId>
-      <version>1.9.2</version>
+      <version>1.8.2</version>
     </dependency>
 
     <!-- and for testing we need logback -->