Remove unused imports in vcpe python scripts

Unused imports are removed according to pylint report
or ignore rules are added where applicable.

Change-Id: I8c32b5c3f456f0444f8ec8980910d470b7238a7d
Issue-ID: INT-1427
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
diff --git a/test/vcpe/loop.py b/test/vcpe/loop.py
index 43255c9..1636e39 100755
--- a/test/vcpe/loop.py
+++ b/test/vcpe/loop.py
@@ -2,14 +2,7 @@
 
 import time
 import logging
-import json
-import mysql.connector
-import ipaddress
-import re
-import sys
-import base64
-from vcpecommon import *
-import preload
+from vcpecommon import * # pylint: disable=W0614
 import commands
 import vcpe_custom_service
 import argparse