Snabb AFTR YANG model unique namespace for major version bumps

[plajjan]

YANG (RFC6020) and RFC7950 specifies clear guidelines on what changes are allowed when modifying a model and incrementing its revision. The changes made to the snabbaftr model from v1 to v2 break those rules. Thus, to implement this according to the RFC you have to identify these as two separate models and not as two revisions of the same model.

The namespace is the unique identifier so please change the namespace of the v2 model, for example to include v2 in the name.

For anyone interested, I wrote a bit about this http://plajjan.github.io/YANG-versioning/