Add compat imports for collections.abc.
Review Request #11881 — Created Nov. 23, 2021 and submitted — Latest diff uploaded
Python 3.10 removed a bunch of deprecated aliases for items in the
collections.abc module. Unfortunately for us, both Django 1.11 and nose
rely on these imports. This change adds a compat module that will
recreate the aliases we need.
Ran unit tests with Python 3.10.