[Nfd-dev] NFD combine management protocols

[Junxiao Shi]

Dear folks

NFD is having too many protocols for management.
This proposal is to combine most of these into a single "NFD Management
protocol".

Changes

   - "NFD Management protocol" only contains commands that can alter
   forwarder state.
   - Every command is signed.
      - Face Status protocol and FIB Enumeration protocol are not part of
      this protocol, and will be kept separate.
   - The semantics of all commands are unchanged.
   - The encoding of requests has a small change:
   - FaceManagementOptions, FibManagementOptions, StrategyChoiceOptions are
      combined into one type
      - Existing code just needs to use reassigned TLV-TYPE numbers
   - LocalControlHeader enabling protocol has a syntax change:
   /localhost/nfd/control-header/enable|disable/<options>
      - One or more control modules can be indicated in
      ControlCommandOptions block

New documentation
The documentation of "NFD Management protocol" would have the following
sections:

   1. Control Command
      - "Control Command" is used by commands that can alter forwarder
      state.
      - request format:
      /localhost/nfd/<management-module>/<command-verb>/<options>/<timestamp>/<random-value>/<SignatureInfo>/<SignatureValue>
      - authentication: a link to [[Command Interests]]
      - options: definition of ControlCommandOptions block
   2. status dataset
      - This section describes how to segment a collection of status blocks
      (FaceStatus blocks in Face Status protocol, FibEntry blocks in FIB
      Enumeration protocol), and how these segments are named
   3. Notification mechanism
   4. Forwarder Status protocol
      - returns global counters
   5. Face Management protocol
      - uses: Control Command, status dataset (for status), Notification
      mechanism (for status change notification)
   6. LocalControlHeader Enabling protocol
      - uses: Control Command
   7. FIB Management protocol
      - uses: Control Command, status dataset (for enumeration)
   8. Strategy Choice protocol
   - uses: Control Command


Local Control Header will still have its own page which describes the
format of the header. Enabling protocol is linked to the section in "NFD
Management protocol".



Please give your feedback.

Yours, Junxiao
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