Prevent config to schedule multiple InDetUsedInVertexFitTrackDecorator doing the same thing

This is an attempt to fix https://its.cern.ch/jira/browse/ATLASRECTS-6925

The configuration is changed in various places

• A config module dedicated to UsedInVertexFitTrackDecorato is introduce and allows to build unique alg names according to trk,vtx and decoration (thus avoiding duplication)
• The jet config is made to use the above module and not it's own private alg (thus temporarily breaking compatibility with AnalysisBase release)
• Some run2 style remnants of pflow config are removed.

Tagging the experts I know on the jet & pflow side, don't hesitate to add more. @mhodgkin @cdelitzs @khoo @sawyer @schaarsc