[engine] more versions updating
 - use latest maven plugins versions
 - factorize junit and slf4j versions in parent pom
 - tests: upgrade hsqldb from 1.7.1 to 2.3.4, and fix subsequent little glitches
 - tests: upgraded commons-io from 2.4 to 2.5



git-svn-id: https://svn.apache.org/repos/asf/velocity/engine/trunk@1765033 13f79535-47bb-0310-9956-ffa450edef68
4 files changed