Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56451
Make resources accessed via a context alias accessible via JNDI in the same way standard resources are available.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1592052 13f79535-47bb-0310-9956-ffa450edef68