Remove unused imports in mass-pnf-sim.py

Change-Id: Idf48efd38395afc4fcb85d42e79a26f94f59a02b
Issue-ID: INT-1427
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
diff --git a/test/mocks/mass-pnf-sim/mass-pnf-sim.py b/test/mocks/mass-pnf-sim/mass-pnf-sim.py
index c3a17b0..353631d 100755
--- a/test/mocks/mass-pnf-sim/mass-pnf-sim.py
+++ b/test/mocks/mass-pnf-sim/mass-pnf-sim.py
@@ -1,8 +1,6 @@
 #!/usr/bin/env python3
 import argparse
 import sys
-from subprocess import *
-from subprocess import STDOUT
 import subprocess
 import ipaddress
 import time