BibTasklets: fix packages conversion in CONSYN

Co-authored-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
BibTasklests: consyn tasklet refactoring

* Removes unused functions.

* Uses os.walk to navigate through the
  files on the file system.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
BibTasklets: improve one-time CONSYN harvesting

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>