disable openbooks to be built during release

Becasue it causes a build loop.
The openbook example build.xml needs a 'install' target to be run 
before you can execute it. But this doesn't get performed during a release.


git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1674483 13f79535-47bb-0310-9956-ffa450edef68

openjpa-examples/openbooks/pom.xml

@@ -231,6 +231,17 @@
                 </plugins>
             </build>
         </profile>
+
+
+        <!--
+            Profile to openbooks to be built during a release (because it creates a build loop).
+            Activating this profile will simply disable the default profile
+         -->
+        <profile>
+            <id>apache-release</id>
+        </profile>
+
+
     </profiles>
 </project>