[misc] do not read HOST_IP (#10644)

Signed-off-by: youkaichao <youkaichao@gmail.com>

vllm/utils.py

@@ -467,6 +467,13 @@ async def collect_from_async_generator(
 
 def get_ip() -> str:
     host_ip = envs.VLLM_HOST_IP
+    if "HOST_IP" in os.environ and "VLLM_HOST_IP" not in os.environ:
+        logger.warning(
+            "The environment variable HOST_IP is deprecated and ignored, as"
+            " it is often used by Docker and other software to"
+            "interact with the container's network stack. Please"
+            "use VLLM_HOST_IP instead to set the IP address for vLLM processes"
+            " to communicate with each other.")
     if host_ip:
         return host_ip