using reentrant locks instead of old synchronized

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1598071 13f79535-47bb-0310-9956-ffa450edef68
adding jcache-fast.sh to test quickly jcache build and calling pending tasks before shutdown on JCache

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1598074 13f79535-47bb-0310-9956-ffa450edef68