[c-nsp] IOS-XR 5.3.3 add Yang Models

[Christian Kildau]

Hi cisco-nsp,

we're currently experimenting with netconf/yang on IOS-XR 5.3.3 (asr9k).
The out of the box supported yang models are somewhat limited. E.g. there
is no model that supports editing ACLs.

I have found https://github.com/YangModels/yang which lists lots of yang
models, but have not yet found a way to upload these models via
$searchengine.

Anyone experienced with netconf/yang that can shed some light on this?

Best regards,
Chris