Integrate memcached into setup playbook

awx/settings/local_settings.py.docker_compose

@@ -48,21 +48,6 @@ if is_testing(sys.argv):
     
     MONGO_DB = 'system_tracking_test'
 
-# Django Caching Configuration
-if is_testing():
-    CACHES = {
-        'default': {
-            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
-        },
-    }
-else:
-    CACHES = {
-        'default': {
-            'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
-            'LOCATION': 'memcached:11211',
-        },
-    }
-
 # Celery AMQP configuration.
 BROKER_URL = 'amqp://guest:guest@rabbitmq//'