VCIO-API-V2: Migrate Debian Importer

[TG1999]

We have used ID as "pkg_name/record_id" for unicity.

[TG1999]

Reference: #2137

[TG1999]

In [1]: from vulnerabilities.models import *

In [2]: from django.db.models import Count

In [3]: duplicates = (
   ...:     AdvisoryV2.objects
   ...:     .values('avid', 'url'
   ...:     )
   ...:     .annotate(count=Count('id'))
   ...:     .filter(count__gt=1)
   ...: )

In [4]: duplicates
Out[4]: <AdvisoryV2QuerySet []>

No dupe Avid is found post import of data.

Reference:

#2137

This issue is done now