[dist] Fix name of Hadoop filesystem plugin (alibaba#182)

This closes alibaba#178

Author: michaelkoepf

fluss-dist/src/main/assemblies/plugins.xml

@@ -27,9 +27,10 @@
 
     <files>
         <!-- filesystem -->
+        <!-- output directory should correspond to the file system *schema* name, i.e., plugins/<schema>/  -->
         <file>
             <source>../fluss-filesystems/fluss-fs-hadoop/target/fluss-fs-hadoop-${project.version}-with-dependencies.jar</source>
-            <outputDirectory>plugins/hadoop/</outputDirectory>
+            <outputDirectory>plugins/hdfs/</outputDirectory>
             <destName>fluss-fs-hadoop-${project.version}.jar</destName>
             <fileMode>0644</fileMode>
         </file>