[ci] feat: make the test_torchrun_example run with tp=2, external_dp=2 (#15172)

Signed-off-by: Chi Zhang <zhangchi.usc1992@bytedance.com>
Signed-off-by: youkaichao <youkaichao@gmail.com>
Co-authored-by: youkaichao <youkaichao@gmail.com>

tests/distributed/test_torchrun_example.py

@@ -9,6 +9,8 @@ import torch.distributed as dist
 from vllm import LLM, SamplingParams
 from vllm.distributed.parallel_state import get_world_group
 
+dist.init_process_group(backend="gloo")
+
 # Create prompts
 prompts = [
     "Hello, my name is",