Move CACHES import into function scope to prevent side effects.

kolibri/utils/main.py

@@ -25,7 +25,6 @@
 from kolibri.core.upgrade import matches_version
 from kolibri.core.upgrade import run_upgrades
 from kolibri.core.utils.cache import process_cache
-from kolibri.deployment.default.cache import CACHES
 from kolibri.deployment.default.sqlite_db_names import ADDITIONAL_SQLITE_DATABASES
 from kolibri.plugins.utils import autoremove_unavailable_plugins
 from kolibri.plugins.utils import check_plugin_config_file_location
@@ -225,6 +224,10 @@ def _upgrades_before_django_setup(updated, version):
 
 
 def _post_django_initialization():
+    # Import here to prevent the module level access to Kolibri options
+    # which causes premature registration of Kolibri plugins.
+    from kolibri.deployment.default.cache import CACHES
+
     if "process_cache" in CACHES:  # usually it means not using redis
         if "DatabaseCache" not in CACHES["process_cache"]["BACKEND"]:
             try: