Fix naive test and tuner test on Windows pipeline with sleep (#1800)

test/metrics_test/trial.py

@@ -6,6 +6,7 @@ import nni
 
 if __name__ == '__main__':
     nni.get_next_parameter()
+    time.sleep(1)
     for i in range(10):
         if i % 2 == 0:
             print('report intermediate result without end of line.', end='')

test/naive_test/naive_trial.py

@@ -9,6 +9,7 @@ params = nni.get_next_parameter()
 print('params:', params)
 x = params['x']
 
+time.sleep(1)
 for i in range(1, 10):
     nni.report_intermediate_result(x ** i)
     time.sleep(0.5)