[MPIR-306] Upgrade to maven-plugins version 25 to 26
 - Fixed several checkstyle reported errors.


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1637570 13f79535-47bb-0310-9956-ffa450edef68
- Removed unused code.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1637571 13f79535-47bb-0310-9956-ffa450edef68