Address the need for coherent pluggable opaque attributes.

[reza-github]

This issue is created to discuss the various aspects of coherent pluggable opaque attributes"

• Why we need them?
• Why YANG augmentation is not engough? We need to discuss plug&play what is the role of host, plug interaction

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actn-wdm-pluggable-modelling/draft-rokui-ccamp-actn-wdm-pluggable-modelling.md

Line 440 in b25297c

* {{plug-vendor-specific-attributes}}: Support of Opaque Attributes

Opaque attributes have still to be discussed and agreed. I've open a specific issue for that.
The related section in the proposed version of the draft should be deleted here, and copied/pasted into this issue

See issue #13