DDF-895 Removed the CDDA OpenSearch functionality and updated the remain...

...ing OpenSearchSource to remove unused methods and variables.  Also cleaned up the OpenSearchSiteUtil and removed methods that were only used by CDDA.  Finally removed unused interface and additional class that was only used by CDDA

The final piece of this ticket is in the ddf repository which is removing the ddf.DefaultSiteSecurity.cfg file

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