misc: fix python sonarcloud BLOCKER level issues

Fix of the top 11 python issues flagged as BLOCKER.

Ticket: VPP-1856
Type: fix

Change-Id: Icf4691e62f4a69d6ee196b6d6e2ab52d961b5c76
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>

test/vpp_pg_interface.py

@@ -1,7 +1,8 @@
 import os
-import time
+import socket
 from socket import inet_pton, inet_ntop
 import struct
+import time
 from traceback import format_exc, format_stack
 
 import scapy.compat