Clarify meaning of "capabilities" and "roles"

[adammontville]

Henk raised this issue during the 2015-04-17 endpoint ID design meeting. The present architecture draft doesn't clearly articulate what a "capability" and sometimes (potentially) confuses "capability" with "role". These terms and their use should be clarified.

[llorenzin]

Resolution

• change existing use of "capability" to "function"
• add a discussion of "capability" as being able to talk a specific data model, data operations, or SACM transport
• be specific about what kind of capability / what kind of function we're talking about
• data plane function / control plane function reside in the SACM component
• data plane capabilities / control plane capabilities can be discovered via querying the controller

[llorenzin]

Started fixes in -04

• changed existing use of "capability" to "function"
• stubbed in a section for "capability" / discovery
• clarifications around functions

[llorenzin]

Henk is okay with closing this issue.

[jimsch]

Given that the comment says that it was started in -04 has this been finished yet?