Move scanner results processing in scanner itself instead of handing over to invoker

[navidshaikh]

Few scanners will export results and expect invokers to process the results to generate the meaningful summary. This adds two level of processing. The scanner itself should process the summary. This will help reduce complexity.
The outcome would be, invoker can just copy over the results generated by atomic scanner in desired output directory and fetch summary from scanner for presentation.

[bamachrn]

@navidshaikh this is no longer required right?