Universal Device Poller to get the the Overlay VPN State. Will return 'other', 'down', or 'up'

Thanks to rhrohde​ and ryan.davis26​ for pointng me in the right direction for this.

I did some searching and found this nice write-up from Stephen J. Occhiogrosso

OTV OID | CCIE or Null!

This led me to finding this reference


Edit - This appears to only work on NX-OS, and not on IOS-XE