Display path of vnetlib during interface creations

Ref https://github.com/GNS3/gns3-gui/issues/1648

gns3server/utils/vmnet.py

@@ -150,6 +150,8 @@ def vmnet_windows(args, vmnet_range_start, vmnet_range_end):
     if not shell.IsUserAnAdmin():
         raise SystemExit("You must run this script as an administrator")
 
+    print("Using ", vnetlib_path, " for controlling vmnet")
+
     if args.list:
         raise SystemExit("Not implemented")
 
@@ -171,6 +173,7 @@ def vmnet_windows(args, vmnet_range_start, vmnet_range_end):
     os.system("net stop npcap")
     os.system("net start npcap")
 
+
 def vmnet_unix(args, vmnet_range_start, vmnet_range_end):
     """
     Implementation on Linux and Mac OS X.