Add some JSON interfaces to the edge management port

[hamishcoleman]

This allows a couple of things:

• allows the removal of presentation logic from inside the edge binary
• machine readable queries would help to allow automated tests (eg: once there is a stable protocol, we could confirm that the built binaries can establish a connection to the public supernode within a specified timeframe)

[codecov-commenter]

Codecov Report

Merging #854 (e97e976) into dev (1670b14) will decrease coverage by 0.13%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev     #854      +/-   ##
==========================================
- Coverage   18.96%   18.83%   -0.14%     
==========================================
  Files          39       39              
  Lines        8247     8305      +58     
==========================================
  Hits         1564     1564              
- Misses       6683     6741      +58     

Impacted Files	Coverage Δ
src/edge_utils.c	1.04% <0.00%> (-0.04%)	:arrow_down:

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[Logan007]

What a wonderful idea!

As you brought up json, I would like to reveal an idea we were pondering for a while. We have actually been thinking of implementing a tiny http-server for management port output maybe also allowing to make some settings, such as a reload_communities button (instead of command to management port), or verb+ or verb-...

Do you know if there is some simple java script delivered along with the json data in an html-doc and which can make the json data be displayed in a nice way?

Oh, and let me know when I can merge this PR.

[hamishcoleman]

I imagine that having a small webserver would help a lot of people who cannot or do not want to use netcat :-) - it does run the risk of adding feature bloat to the core.

Javascript is not my usual playground, but the simple python logic I have used in my str_table() should be easily portable to javascript (and there would be a zillion heavier-weight options floating around the net)

You can merge this PR

[hamishcoleman]

@Logan007 As an alternative to embedding a http server in the edge process, I've added a simple http gateway server to this commit.

[Logan007]

WOW! :open_mouth:

Thank you so much!