HDFS-11473. Ozone : exclude cblock protobuf files from findbugs check. Contributed by Xiaoyu Yao.

hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml

@@ -20,6 +20,9 @@
      <Match>
        <Package name="org.apache.hadoop.ozone.protocol.proto" />
      </Match>
+     <Match>
+       <Package name ="org.apache.hadoop.cblock.protocol.proto" />
+     </Match>
      <Match>
        <Bug pattern="EI_EXPOSE_REP" />
      </Match>