Fix expire_old_entitlements celery task

Celery was not able to find the task implementation, because we were
putting it in a nonstandard place.

common/djangoapps/entitlements/management/commands/expire_old_entitlements.py

@@ -7,7 +7,7 @@ import logging
 from django.core.management import BaseCommand
 
 from entitlements.models import CourseEntitlement
-from entitlements.tasks.v1.tasks import expire_old_entitlements
+from entitlements.tasks import expire_old_entitlements
 
 logger = logging.getLogger(__name__)  # pylint: disable=invalid-name
 

common/djangoapps/entitlements/management/commands/tests/test_expire_old_entitlements.py

@@ -10,7 +10,7 @@ from entitlements.tests.factories import CourseEntitlementFactory
 
 
 @skip_unless_lms
-@mock.patch('entitlements.tasks.v1.tasks.expire_old_entitlements.delay')
+@mock.patch('entitlements.tasks.expire_old_entitlements.delay')
 class TestExpireOldEntitlementsCommand(TestCase):
     """
     Test expire_old_entitlement management command.

common/djangoapps/entitlements/tests/test_tasks.py

@@ -8,8 +8,8 @@ import pytz
 
 from django.test import TestCase
 
+from entitlements import tasks
 from entitlements.models import CourseEntitlementPolicy
-from entitlements.tasks.v1 import tasks
 from entitlements.tests.factories import CourseEntitlementFactory
 from openedx.core.djangolib.testing.utils import skip_unless_lms