[MCHECKSTYLE-169] Suppressions property is incorrectly set if suppressions file is on classpath
Submitted by: Sergei Ivanov
Reviewed by: Dennis Lundberg

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1570730 13f79535-47bb-0310-9956-ffa450edef68