docstr: get all proxy nodes in Milvus deployment
docstr_tok: ["get","all","proxy","nodes","in","Milvus","deployment"]
code: def proxy_nodes(self):
      """get all proxy nodes in Milvus deployment"""
      proxy_nodes = []
      for node in self.nodes:
          if "proxy" == node.get("infos").get("type"):
              proxy_nodes.append(node)
      return proxy_nodes
  
file_path: milvus/tests/python_client/common/milvus_sys.py
imports: import ujson
  import json
  from pymilvus.grpc_gen import milvus_pb2
  from pymilvus import connections
label_desc: Use image node_id 9 for calling the MilvusSys obj's underlying member method code with example usage: obj.proxy_nodes() and returns: proxy_nodes