fixed broken tests

Author: Andrei Neagu

services/director-v2/tests/unit/with_dbs/test_modules_dynamic_sidecar_docker_service_specs.py

@@ -83,10 +83,10 @@ def mock_env(
             "RABBIT_USER": "admin",
             "RABBIT_SECURE": "false",
             "REDIS_HOST": "redis",
-            "REDIS_PASSWORD": "None",
+            "REDIS_PASSWORD": "null",
             "REDIS_PORT": "6789",
             "REDIS_SECURE": "False",
-            "REDIS_USER": "None",
+            "REDIS_USER": "null",
             "REGISTRY_AUTH": "false",
             "REGISTRY_PW": "test",
             "REGISTRY_SSL": "false",
@@ -286,10 +286,10 @@ def expected_dynamic_sidecar_spec(
                     "RABBIT_USER": "admin",
                     "RABBIT_SECURE": "False",
                     "REDIS_HOST": "redis",
-                    "REDIS_PASSWORD": "None",
+                    "REDIS_PASSWORD": "null",
                     "REDIS_PORT": "6789",
                     "REDIS_SECURE": "False",
-                    "REDIS_USER": "None",
+                    "REDIS_USER": "null",
                     "R_CLONE_OPTION_BUFFER_SIZE": "16M",
                     "R_CLONE_OPTION_RETRIES": "3",
                     "R_CLONE_OPTION_TRANSFERS": "5",