WIP: Feature new inventory plugin for version v2+

[rvalle]

This PR provides:

• new inventory plugin #26

[codecov[bot]]

Codecov Report

Merging #61 (cdc82d3) into master (badff84) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #61   +/-   ##
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  Coverage   84.34%   84.34%           
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  Files          53       53           
  Lines        5500     5500           
  Branches     1246     1246           
=======================================
  Hits         4639     4639           
  Misses        431      431           
  Partials      430      430           

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[rvalle]

@resmo you can review now if you want. I just have one more thing to do. I have a list of use cases of grouping and filtering that I want to check are viable with the selected inner template of the inventory plugin.

[rvalle]

@resmo, the pending coverage issue is telling us that we need a test where authentication fails (missing key or secret). I am find with adding it, but I wonder why didn't we get this message before (?)

[rvalle]

the sanity fails because bumping to 2.0.0 requires #60

[rvalle]

this PR has a dependency on #62 because of the deprecation thing.

[rvalle]

I will rebase the PR to the new 2.0

[rvalle]

@resmo I have rebased to v2, still WIP

It is not clear how to configure the environment plugin: no idea how to implement environment fallback for this kind of plugin, it is currently WIP.

[rvalle]

PR replaced by #66 for the purpose of cleaning the branch