HADOOP-17663. Remove useless property hadoop.assemblies.version in pom file. (#3025)

Reviewed-by: Wei-Chiu Chuang <weichiu@apache.org>

hadoop-project/pom.xml

@@ -52,7 +52,6 @@
 
     <kafka.version>2.4.0</kafka.version>
 
-    <hadoop.assemblies.version>3.4.0-SNAPSHOT</hadoop.assemblies.version>
     <commons-daemon.version>1.0.13</commons-daemon.version>
 
     <test.build.dir>${project.build.directory}/test-dir</test.build.dir>