* dak/check_proposed_updates.py: Import stuff from daklib as
"import daklib.foo as foo"
* dak/clean_proposed_updates.py: likewise
* dak/clean_queues.py: likewise
* dak/clean_suites.py: likewise
* dak/check_proposed_updates.py: Import stuff from daklib as
"import daklib.foo as foo"
* dak/clean_proposed_updates.py: likewise
* dak/clean_queues.py: likewise
* dak/clean_suites.py: likewise