Render ModelAdmin fieldsets outside admin sites

Review Request #9040 — Created June 27, 2017 and submitted — Latest diff uploaded

Information

Djblets
release-0.10.x
ab1e430...

Reviewers

The filer_fieldsets utility function filters a list of fieldsets
from a django.contrib.admin.ModelAdmin so callers rendering forms
can control which fieldsets (such as internal state) are rendered.

This change also refactors the core fieldset rendering of
form_fieldsets.html into its own template so a single fieldset can
be rendered.

Tested with /r/9013/