OAK-51 : Access Control Management (WIP)

in addition:
- move AbstractSecurityTest to oak/security to oak package
- simplify security tests by moving common code to the AbstractSecurityTest

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1433969 13f79535-47bb-0310-9956-ffa450edef68