[MENFORCER-216] Upgrade to maven-parent version 26
 - Enhanced excludes in maven-enforcer-plugin to add
   the excludes instead of replacing them.


git-svn-id: https://svn.apache.org/repos/asf/maven/enforcer/trunk@1642201 13f79535-47bb-0310-9956-ffa450edef68
Removed part of the pom which has been mentioned to fail
the build if removed which i can't reproduce.


git-svn-id: https://svn.apache.org/repos/asf/maven/enforcer/trunk@1642217 13f79535-47bb-0310-9956-ffa450edef68