Add a Django config for running tests (#2536)

* Add a Django config for running tests

* Rename test settings file to avoid automatic discovery by test runner

* Fix usage string

refinery/config/settings/quick_test.py

@@ -0,0 +1,26 @@
+# Special Django config for testing
+
+# DO NOT use for running the application server
+
+# Speeds up test runs by skipping migrations
+# Disables logging to provide a clean output of test results
+
+# Usage: manage.py test --settings=config.settings.quick_test
+
+from .base import *  # NOQA
+
+logging.disable(logging.CRITICAL)
+
+# TODO: replace MIGRATION_MODULES with a dict after Django 1.9 upgrade
+# https://simpleisbetterthancomplex.com/tips/2016/08/19/django-tip-12-disabling-migrations-to-speed-up-unit-tests.html
+
+
+class DisableMigrations(object):
+    def __contains__(self, item):
+        return True
+
+    def __getitem__(self, item):
+        return 'notmigrations'
+
+
+MIGRATION_MODULES = DisableMigrations()