The 'cmd' module is introduced to make the CLI easy to use. (#10542)

…pdate comand

### What problem does this PR solve?

To make the CLI easy to use.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

admin/services.py

@@ -179,7 +179,6 @@ class ServiceMgr:
         configs = SERVICE_CONFIGS.configs
         for service_id, config in enumerate(configs):
             config_dict = config.to_dict()
-            service_detail = None
             try:
                 service_detail = ServiceMgr.get_service_details(service_id)
                 if service_detail['alive']: