Fixes "Bug in properties management." https://issues.apache.org/jira/browse/OFBIZ-5159

Yesterday, I faced a weird bug in properties management.
For a reason, a copy of a project slipped in the project itself (like if you had a copy of ofbiz root in ofbiz root).
And in this project a properties file (in a hotdeploy component) as the same name than the project (like ofbiz.properties)
Then, as properties for this file, I got all the content of the sub-dir (here would be the files in ofbiz/ofbiz) instead of the properties

This fixes it, no performance issues since properties are cached so properties file are only accessed once

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1470176 13f79535-47bb-0310-9956-ffa450edef68