103438: Working towards a fix for ACE-3948: BM-0004: Factor out select on alf_content_url table during file creation
- Complement the 'getOrCreate' EntityCache calls with 'createOrGet'
- Cleanup of ContentDataDAOImpl code before further changes: tabs, @Override, unused code, etc
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@103622 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261