ehcache 2.6.3

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1447468 13f79535-47bb-0310-9956-ffa450edef68
move spring declaration in WEB-INF/applicationContext.xml to ease manual setup/override

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1447469 13f79535-47bb-0310-9956-ffa450edef68
prevent possible multi thread issues

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1447472 13f79535-47bb-0310-9956-ffa450edef68