Push britney's test requests to debci

Rewrite britney1's debci-put shell implementation into python, and merge it with britney1's scripts/britney2debci.py. The result is the current scripts/debci-put.py shipped in this MR.

This script then is called after we run britney in kali-run-britney.sh.

The current implementation is not as elegant, modular, or configurable as it could be, but it should get the job done and complete the integration goal. We can always refactor some more later on.

Before deploying this to zeus, we may ponder trimming down the existing /srv/repo.kali.org/tools/britney2/output/debci_kali-rolling.input there, as it already contains around 58k requests. melpomene and calliope will of course eventually run everything after some time, but I figured it'd be worth mentioning.