docker-ce: not quitting when panic [ci skip]

Fixes: 28e9dd3

Author: shankerwangmiao

docker-ce.py

@@ -78,7 +78,7 @@ def recursive_get_filelist(self, base_url, filter_meta=False):
         except Exception as e:
             print("Panic: failed to get file list")
             traceback.print_exc()
-            sys.exit(1)
+            os._exit(1)
         if not r.ok:
             return