fixed undefined subprocess issue in test (#228)

Author: mwang2016

testing/integration/testcases/test_nozzle_configurations_local.py

@@ -3,6 +3,7 @@
 from lib.splunk_api import *
 import string
 import random
+import subprocess
 _tag = ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))