fixed broken tests

Author: Andrei Neagu

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

@@ -286,7 +286,7 @@ def expected_dynamic_sidecar_spec(
                     "RABBIT_PORT": "5672",
                     "RABBIT_USER": "admin",
                     "RABBIT_SECURE": "False",
-                    "R_CLONE_OPTION_BUFFER_SIZE": "0M",
+                    "R_CLONE_OPTION_BUFFER_SIZE": "16M",
                     "R_CLONE_OPTION_RETRIES": "3",
                     "R_CLONE_OPTION_TRANSFERS": "5",
                     "R_CLONE_PROVIDER": "MINIO",