upgrade some plugins versions, move selenium tests sources to a standard directory

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/archiva-1.3.x@1523993 13f79535-47bb-0310-9956-ffa450edef68
remove empty directory

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/archiva-1.3.x@1523994 13f79535-47bb-0310-9956-ffa450edef68