Update the cache backend for the new version of celery and djcelery.

lms/envs/aws.py

@@ -64,8 +64,7 @@ BROKER_POOL_LIMIT = 0
 BROKER_CONNECTION_TIMEOUT = 1
 
 # For the Result Store, use the django cache named 'celery'
-CELERY_RESULT_BACKEND = 'cache'
-CELERY_CACHE_BACKEND = 'celery'
+CELERY_RESULT_BACKEND='djcelery.backends.cache:CacheBackend'
 
 # When the broker is behind an ELB, use a heartbeat to refresh the
 # connection and to detect if it has been dropped.

lms/envs/bok_choy.py

@@ -55,8 +55,7 @@ MEDIA_URL = "/static/uploads/"
 ################################# CELERY ######################################
 
 CELERY_ALWAYS_EAGER = True
-CELERY_RESULT_BACKEND = 'cache'
-CELERY_CACHE_BACKEND = 'memory'
+CELERY_RESULT_BACKEND='djcelery.backends.cache:CacheBackend'
 
 ###################### Grade Downloads ######################
 GRADES_DOWNLOAD = {

lms/envs/test.py

@@ -299,8 +299,7 @@ GIT_REPO_DIR = TEST_ROOT / "course_repos"
 ################################# CELERY ######################################
 
 CELERY_ALWAYS_EAGER = True
-CELERY_RESULT_BACKEND = 'cache'
-CELERY_CACHE_BACKEND = 'memory'
+CELERY_RESULT_BACKEND='djcelery.backends.cache:CacheBackend'
 
 ######################### MARKETING SITE ###############################