use celery, redis-py version from requirements

setup.py

@@ -16,8 +16,8 @@ setup(
         'jsonschema',
         'paramiko',
         'flask',
-        'redis',
-        'celery',
+        'redis==3.2.1',
+        'celery==4.3.0',
         'junos-eznc',
         'lxml',
         'requests',