HADOOP-13689. Do not attach javadoc and sources jars during non-dist build.

(cherry picked from commit bf372173d0f7cb97b62556cbd199a075254b96e6)

hadoop-project-dist/pom.xml

@@ -85,22 +85,6 @@
           </execution>
         </executions>
       </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-source-plugin</artifactId>
-        <executions>
-          <execution>
-            <phase>prepare-package</phase>
-            <goals>
-              <goal>jar</goal>
-              <goal>test-jar</goal>
-            </goals>
-          </execution>
-        </executions>
-        <configuration>
-          <attach>true</attach>
-        </configuration>
-      </plugin>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>findbugs-maven-plugin</artifactId>