CAY-1918 Replace Oracle LOB hacks with JDBC 4.0 API

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1577986 13f79535-47bb-0310-9956-ffa450edef68
CAY-1918 Replace Oracle LOB hacks with JDBC 4.0 API

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1577987 13f79535-47bb-0310-9956-ffa450edef68