Allow configurable source for cookie name

[zerosym]

If username is mutable a new cookie is set every time the username (or email, in the case of USERNAME_FIELD='email') is changed. Redefining get_username to return a fixed identifier that may be semantically meaningless is undesirable.

django-agent-trust/src/django_agent_trust/middleware.py

Line 48 in f550143

cookie_name = self._cookie_name(request.user.get_username())