[feature] Added multitenant capablities to django-filters #346

[Aryamanz29]

Todo

• Add tests.
• Add docs.

Closes #346

[coveralls]

Coverage: 97.811% (-0.06%) from 97.872% when pulling e173d71 on issue-346/add-multi-tenant-capablities-dj-filters into 452ad6e on master.

[nemesifier]

Great progress @Aryamanz29! 👏

I did some testing and it's working well.
There's some room for improvement, since this is going to become a feature we will use in all our modules.

I believe we should add something like this to this library to avoid repeating the same over and over in all modules:

class BaseOrganizationFilter(FilterDjangoByOrgManaged):
   organization_slug = filters.CharFilter(field_name='organization__slug')
   class Meta:
       fields = ['organization', 'organization_slug']

Usage example in Network Topology module:

class OrganizationFilter(BaseOrganizationFilter):
    class Meta(BaseOrganizationFilter.Meta):
        model = Node

See also my comments below.