remove unused import

Motherlode/pipeline_manager.py

-from docker.client import DockerClient
 import os
 import py2neo
 import docker
@@ -65,8 +64,8 @@ class PipelineManager:
                 json.dumps(params, indent=4)
             )
         )
-        container_manager.image_reg_data = container_manager.docker_client.images.get_registry_data(
-            **params
+        container_manager.image_reg_data = (
+            container_manager.docker_client.images.get_registry_data(**params)
         )
 
     def _create_log_node_pipeline_run(self):