[CI/Build] Use 127.0.0.1 instead of localhost in utils (vllm-project#26750)

Signed-off-by: Ye (Charlotte) Qi <yeq@meta.com>

Author: yeqcharlotte

tests/utils.py

@@ -157,7 +157,7 @@ def __init__(
             self.host = None
             self.port = None
         else:
-            self.host = str(args.host or "localhost")
+            self.host = str(args.host or "127.0.0.1")
             self.port = int(args.port)
 
         self.show_hidden_metrics = args.show_hidden_metrics_for_version is not None