OAK-527: permissions (WIP: missing handling for ac content in Session#hasPermission)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1466882 13f79535-47bb-0310-9956-ffa450edef68
OAK-527: permissions (WIP: tests)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1466883 13f79535-47bb-0310-9956-ffa450edef68