Remove redundant manifest entries for javadoc and source plugins (#703)

It was added in ASF parent 36
- apache/maven-apache-parent#548

so configuration can be simplified

Author: slawekjaranowski

pom.xml

@@ -456,12 +456,6 @@
               <link>${commons.javadoc.javaee.link}</link>
             </links>
             <additionalOptions>${commons.javadoc.options}</additionalOptions>
-            <archive>
-              <manifest>
-                <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
-                <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
-              </manifest>
-            </archive>
             <!-- &#160; is non-breaking space -->
             <bottom>
               Copyright © {inceptionYear}-{currentYear} {organizationName}. All rights reserved.&lt;/br&gt;
@@ -915,14 +909,6 @@
       </plugin>
       <plugin>
         <artifactId>maven-source-plugin</artifactId>
-        <configuration>
-          <archive>
-            <manifest>
-              <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
-              <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
-            </manifest>
-          </archive>
-        </configuration>
         <executions>
           <execution>
             <id>create-source-jar</id>