Stop attempting to load extensions in manage.py.
Review Request #10531 — Created April 13, 2019 and submitted
manage.pyattempted to load any extensions in order to factor in their
models for database upgrades and management commands for execution. This
hasn't actually been needed for a while, and isn't compatible with
Django 1.11 at all.
This change removes this logic entirely from
Verified that management commands worked correctly on Django 1.6 and 1.11,
and that upgrades worked on Django 1.6 (and were attempted on 1.11, though
that requires more work to complete compatibility).