HADOOP-12905. Clean up CHANGES.txt RAT exclusions from pom.xml files. Contributed by Chris Nauroth.

(cherry picked from commit 89b16d27e26216fc4e5153683105b323c310a0af)

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/pom.xml
	hadoop-mapreduce-project/pom.xml

(cherry picked from commit 38a031ce68c65956b3dd69b6a93baab1be2beac7)

hadoop-common-project/hadoop-common/pom.xml

@@ -473,7 +473,6 @@
         <artifactId>apache-rat-plugin</artifactId>
         <configuration>
           <excludes>
-            <exclude>CHANGES.txt</exclude>
             <exclude>.idea/**</exclude>
             <exclude>src/main/conf/*</exclude>
             <exclude>src/main/docs/**</exclude>

hadoop-hdfs-project/hadoop-hdfs/pom.xml

@@ -369,8 +369,6 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
         <artifactId>apache-rat-plugin</artifactId>
         <configuration>
           <excludes>
-            <exclude>CHANGES.txt</exclude>
-            <exclude>CHANGES.HDFS-1623.txt</exclude>
             <exclude>.gitattributes</exclude>
             <exclude>.idea/**</exclude>
             <exclude>src/main/conf/*</exclude>

hadoop-mapreduce-project/pom.xml

@@ -194,7 +194,6 @@
         <configuration>
           <excludes>
             <exclude>.eclipse.templates/</exclude>
-            <exclude>CHANGES.txt</exclude>
             <exclude>lib/jdiff/**</exclude>
           </excludes>
         </configuration>

hadoop-yarn-project/pom.xml

@@ -104,15 +104,6 @@
           </execution>
         </executions>
       </plugin>
-      <plugin>
-        <groupId>org.apache.rat</groupId>
-        <artifactId>apache-rat-plugin</artifactId>
-        <configuration>
-          <excludes>
-            <exclude>CHANGES.txt</exclude>
-          </excludes>
-        </configuration>
-      </plugin>
     </plugins>
   </build>