chore: cleanup cloud RAD generation (#1502)

Same as googleapis/java-shared-config#344

Author: eaball35

pom.xml

@@ -695,35 +695,44 @@
           <name>docFX</name>
         </property>
       </activation>
-      <reporting>
+      <properties>
+        <!-- default config values -->
+        <docletName>java-docfx-doclet-1.3.0</docletName>
+        <outputpath>${project.build.directory}/docfx-yml</outputpath>
+        <projectname>${project.artifactId}</projectname>
+        <excludeclasses></excludeclasses>
+        <excludePackages>com\.google\.api\.client\.findbugs:com\.google\.api\.client\.test:com\.google\.api\.services</excludePackages>
+        <source>8</source>            
+        <sourceFileExclude></sourceFileExclude>
+      </properties>
+      <build>
         <plugins>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-javadoc-plugin</artifactId>
             <version>3.3.1</version>
-            <reportSets>
-              <reportSet>
-                <id>docFX</id>
-                <reports>
-                  <report>javadoc</report>
-                  <report>aggregate</report>
-                  <report>aggregate-jar</report>
-                </reports>
-              </reportSet>
-            </reportSets>
             <configuration>
               <doclet>com.microsoft.doclet.DocFxDoclet</doclet>
               <useStandardDocletOptions>false</useStandardDocletOptions>
-              <docletPath>${env.KOKORO_GFILE_DIR}/java-docfx-doclet-1.3.0.jar</docletPath>
+               <!-- custom config with -Dproperty=value -->
+              <docletPath>${env.KOKORO_GFILE_DIR}/${docletName}.jar</docletPath>
               <additionalOptions>
-                -outputpath ${project.build.directory}/docfx-yml
-                -projectname ${artifactId}
-                -excludepackages com\.google\.api\.client\.findbugs:com\.google\.api\.client\.test:com\.google\.api\.services
+                -outputpath ${outputpath} 
+                -projectname ${projectname} 
+                -excludeclasses ${excludeclasses}: 
+                -excludepackages ${excludePackages}:
               </additionalOptions>
+              <doclint>none</doclint>
+              <show>protected</show>
+              <nohelp>true</nohelp>
+              <source>${source}</source>
+              <sourceFileExcludes>
+                <exclude>${sourceFileExclude}</exclude>
+              </sourceFileExcludes>
             </configuration>
-          </plugin>
+          </plugin>  
         </plugins>
-      </reporting>
-    </profile>
+      </build>
+    </profile>    
   </profiles>
 </project>