add chamber_ip and vna_ip to json file

Python_script/test_stand_parameter.json

-{"delta_temp": 0.1, "delta_hum": 1, "delta_mag": 0.1 , "delta_phase": 0.02, "sleep_time": 10.0, "frequency": 1300000000, "vna_config_file": "climate-lab.znxml"}
+{"delta_temp": 0.1, "delta_hum": 1, "delta_mag": 0.1 , "delta_phase": 0.02, "sleep_time": 10.0, "frequency": 1300000000, "vna_config_file": "climate-lab.znxml","chamber_ip":"localhost", "vna_ip":"localhost"}