Remove atdb host as it will be configured in the database

ldvspec/ldvspec/settings/base.py

@@ -132,7 +132,6 @@ REST_FRAMEWORK = {
     'PAGE_SIZE': 100
 }
 
-ATDB_HOST = os.environ.get('ATDB_HOST', 'http://localhost:8000/atdb/')
 # Recommended to use an environment variable to set the broker URL.
 CELERY_BROKER_URL = os.getenv("CELERY_BROKER_URL", "amqp://guest@localhost:5672")