New VM Instance Inventory Plugin

[rvalle]

This PR fixes #26

This is a clean version of PR #61

[codecov]

Codecov Report

Merging #66 (56099f8) into master (badff84) will decrease coverage by 0.07%.
The diff coverage is 80.23%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   84.36%   84.29%   -0.08%     
==========================================
  Files          53       56       +3     
  Lines        5500     5590      +90     
  Branches     1246     1256      +10     
==========================================
+ Hits         4640     4712      +72     
- Misses        429      443      +14     
- Partials      431      435       +4     

Impacted Files	Coverage Δ
plugins/inventory/instance.py	79.26% <79.26%> (ø)
plugins/doc_fragments/cloudstack_environment.py	100.00% <100.00%> (ø)
plugins/module_utils/cloudstack.py	71.95% <0.00%> (-0.23%)	⬇️
plugins/modules/cs_physical_network.py	82.55% <0.00%> (ø)
plugins/doc_fragments/cloudstack.py	100.00% <0.00%> (ø)

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[resmo]

not a blocker but consider spaces between brackets.