Several language style improvements in log messages

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1642539 13f79535-47bb-0310-9956-ffa450edef68
[MPMD-129] Maven PMD plugin does not have suppressMarker property that is available in PMD itself

Contributed-by: Andreas Dangel, Svetlomira Manova

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1642541 13f79535-47bb-0310-9956-ffa450edef68