remove file_name parameter because it's not used in function (microsoft#252)

Author: cindyweng

ml_service/pipelines/load_sample_data.py

@@ -5,7 +5,7 @@
 
 # Loads the diabetes sample data from sklearn and produces a csv file that can
 # be used by the build/train pipeline script.
-def create_sample_data_csv(file_name):
+def create_sample_data_csv():
     sample_data = load_diabetes()
     df = pd.DataFrame(
         data=sample_data.data,