not sure why we were setting comp as jndi enc for webContext but should clearly be root + don't overwrite what we put in tomcat jndi - we for sure need to pass again tcks asap

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1616596 13f79535-47bb-0310-9956-ffa450edef68