Fix DBCP-382
Allow accessToUnderlyingConnectionAllowed to be configured when configuration takes place via JNDI in a JavaEE container.
Patch provided by Stefan Rempfer

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1562944 13f79535-47bb-0310-9956-ffa450edef68