Removed declaration of maven-source-plugin.
Removed declaration of maven-source-plugin.

This plug-in is already defined by the parent pom. The additional
declaration caused the GPG signature for the sources jar to be
invalid.

git-svn-id: 0d31da9e303333003508381311333cf78a25d41b@1735901 13f79535-47bb-0310-9956-ffa450edef68

apache/commons-configuration,apache/commons-configuration,apache/commons-configuration