Allow the execution of a custom script after the default Config_Networks

[maps2002]

(Sorry for messing up with the pull requests)
Hi,

Thank you for your great work!

I found myself executing some custom commands (example: iptables rules to disable internet access on a guest network, forcing another guest network traffic thru Tor, etc), after YazFi executed its own logic.
It seemed more logical to try and incorporate a custom script execution capability inside the YazFi script.

Hope to have placed the script calling in the right place, and maybe it can be useful for others.

Thank you!

PS: I know that the most appropriate place to put the script location path is in the configuration file.
If you find the whole feature useful, I can update the code according to your instructions.

[jackyaz]

I haven't forgotten this, I just haven't had the time to look at it fully yet!

[jackyaz]

@maps2002 Merged and amended. Please test latest commit from develop: 949defa

[maps2002]

Tested and working!
Thank you!