Made connection-factory element in entityengine.xml optional: in fact there are transaction managers that do not depend an external connection pool because it is already integrated (e.g. Atomikos Transaction Essentials).


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/framework-api-cleanup@1620316 13f79535-47bb-0310-9956-ffa450edef68