Fix resource parsing and api version lookup.

[brendandburns]

Also add some tests.

Fixes #2695

[tjprescott]

Looks like you get "PEP8"ed. 😁 This change looks great to me. I would recommend @johanste take a look.

[brendandburns]

pep8 issues fixed, please take another look.

[johanste]

Looks good to me.

[codecov-io]

Codecov Report

Merging #2781 into master will decrease coverage by <.01%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master    #2781      +/-   ##
==========================================
- Coverage   62.89%   62.89%   -0.01%     
==========================================
  Files         480      480              
  Lines       25994    25997       +3     
  Branches     3942     3943       +1     
==========================================
+ Hits        16350    16351       +1     
- Misses       8617     8622       +5     
+ Partials     1027     1024       -3

Impacted Files	Coverage Δ
src/azure-cli-core/azure/cli/core/commands/arm.py	89.21% <ø> (ø)	⬆️
...ource/azure/cli/command_modules/resource/custom.py	50.82% <60%> (-0.11%)	⬇️
...dback/azure/cli/command_modules/feedback/custom.py	34.69% <0%> (ø)	⬆️
src/azure-cli-core/azure/cli/core/util.py	68.99% <0%> (ø)	⬆️
...-cli-role/azure/cli/command_modules/role/custom.py	19.28% <0%> (ø)	⬆️

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[tjprescott]

Thanks @brendandburns!!