Add pipe for pipeline detection of inconsistent license detection

As an extension to https://github.com/nexB/scancode.io/issues/30 "Analyze scan for license issues" I would like to be able to plug in a pipeline the analysis of incorrect license detection

In contrast with nexB/scancode-results-analyzer#20 the available data may not be exactly the same as in scanc (and it is stored in the scanpipe database)