Add spanning tree interface policy module and associated tests

[netgirard]

No description provided.

[akinross]

see inline comments

[netgirard]

@akinross just need to add the examples. I commented on the conversations, but left them unresolved so that you or another reviewer can verify before closing. Let me know if you would prefer I resolve them.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03 ⚠️

Comparison is base (ad147dd) 90.14% compared to head (4813dc8) 90.12%.

❗ Current head 4813dc8 differs from pull request most recent head af67efd. Consider uploading reports for the commit af67efd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
- Coverage   90.14%   90.12%   -0.03%     
==========================================
  Files         160      161       +1     
  Lines        7095     7131      +36     
  Branches     1034     1039       +5     
==========================================
+ Hits         6396     6427      +31     
- Misses        593      596       +3     
- Partials      106      108       +2     

Flag	Coverage Δ
integration	91.73% <97.22%> (-0.05%)	⬇️
sanity	36.25% <44.44%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...gins/modules/aci_interface_policy_spanning_tree.py	100.00% <100.00%> (ø)
plugins/modules/aci_contract_subject_to_filter.py	98.24% <0.00%> (-1.76%)	⬇️
plugins/module_utils/aci.py	69.38% <0.00%> (-0.50%)	⬇️

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[akinross]

LGTM

[lhercot]

LGTM

[lhercot]

Thanks for the contribution!