[CI/UT][PD Disaggreate] Initialize PD Disaggreate UT (#889)

Initialize PD Disaggreate UT

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Signed-off-by: MengqingCao <cmq0113@163.com>

examples/disaggregated_prefill/disaggregated_prefill_offline.py

@@ -13,7 +13,7 @@ import time
 from multiprocessing import Event, Process
 
 kv_connector_extra_config = {
-    "prompt_device_ips": ["1.2.3.1", "1.2.3.2"],
+    "prefill_device_ips": ["1.2.3.1", "1.2.3.2"],
     "decode_device_ips": ["1.2.3.9", "1.2.3.10"],
     "llmdatadist_comm_port": 26000,
 }