JCR-3598: Oak in Jackrabbit deployment packages

Add Oak dependencies to jackrabbit-webapp.
Move backwards compatibility tests to -webapp.
Update the Tomcat dependency and streamline test setup.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1489772 13f79535-47bb-0310-9956-ffa450edef68