[MEAR-202] Upgrade to maven-plugins version 25 to 26
 - Fixed checkstyle reported errors.
 - Added/Fixed missing license headers


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636449 13f79535-47bb-0310-9956-ffa450edef68
[MWAR-335] Upgrade maven-archiver dependency to v2.6 (including aligning transitive deps)

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636454 13f79535-47bb-0310-9956-ffa450edef68
Removed transitive dependency exclusion not needed any more

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636457 13f79535-47bb-0310-9956-ffa450edef68