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
This led me to finding this reference
http://oidref.com/1.3.6.1.4.1.9.9.810.1.2.1.1.3
Edit - This appears to only work on NX-OS, and not on IOS-XE