Fix compatibility with Python 3.5

See merge request !17

update consumer and procuser to new api

See merge request !16

Use internal CI runner with access to nims

See merge request !21

Feat: Add parameters to pre_scan

See merge request !20

Feat: Add handling of csv files

See merge request !19

Feat: Add substream name in logs

See merge request !15

Don't create new broker and producer instances

See merge request !14

Before, new broker and producer instances were created for each
substream and immediately replaced with the instances stored in the
application object.
The large amount of new instances is unnecessary and triggered a
resource leak in the Python broker wrapper.

Retry getting group id in case of errors

See merge request !13