[MSITE-701] IT failures with Jdk 8 (EA)
Root cause is in the javadoc-plugin, so changed the version of junit
Actual javadoc issue registered as MJAVADOC-382


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1557555 13f79535-47bb-0310-9956-ffa450edef68