You will have to do this:
nano /usr/bin/vpn_reconnect
Paste the script and then do cntrl + o, cntrl + x
Then:
chmod +x /usr/bin/vpn_reconnect
Then open the rc.local file:
nano /etc/rc.local
Add this to the end of the file just before exit:
/usr/bin/vpn_reconnect &
Do cntrl + o, cntrl + x to save and quit again.
The script should run on boot now 