fix possible values for clientAuth

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1440891 13f79535-47bb-0310-9956-ffa450edef68
fix possible values for clientAuth

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1440892 13f79535-47bb-0310-9956-ffa450edef68