Start work on DBCP-177
Enable getConnection() to work under a security manager

git-svn-id: http://svn.apache.org/repos/asf/commons/proper/dbcp@1565630 13f79535-47bb-0310-9956-ffa450edef68
Fix DBCP-177
Enable DBCP to work with a SecurityManager such that only DBCP needs to be granted the necessary permissions to communicate with the database.

git-svn-id: http://svn.apache.org/repos/asf/commons/proper/dbcp@1565667 13f79535-47bb-0310-9956-ffa450edef68