Refactoring/aws/emr

[Aboisier]

This PR migrated the EMR service to the new architecture, see #183 . There was a hack, caused by an API limitation. I kept it, since refactoring it is a bit out of the scope of this story.

[codecov-io]

Codecov Report

Merging #248 into refactoring/resource-configs will increase coverage by 0.05%.
The diff coverage is 42.85%.

@@                       Coverage Diff                        @@
##           refactoring/resource-configs     #248      +/-   ##
================================================================
+ Coverage                         29.96%   30.01%   +0.05%     
================================================================
  Files                               111      112       +1     
  Lines                              5527     5557      +30     
================================================================
+ Hits                               1656     1668      +12     
- Misses                             3871     3889      +18

Impacted Files	Coverage Δ
ScoutSuite/providers/aws/resources/vpcs.py	35.29% <ø> (ø)	⬆️
ScoutSuite/providers/aws/provider.py	10.29% <0%> (ø)	⬆️
ScoutSuite/providers/aws/facade/facade.py	37.25% <33.33%> (-0.25%)	⬇️
ScoutSuite/providers/aws/facade/emr.py	40% <40%> (ø)
ScoutSuite/providers/aws/resources/emr/service.py	46.42% <46.42%> (ø)
ScoutSuite/providers/aws/configs/services.py	49.18% <50%> (ø)	⬆️

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[vifor2]

As each day passes by, the cataclysm of the great merging between the forces of the refactoring branch and the develop branch nears!

[misg]

Great work! 🎆

[misg]

(You can batch these 4 suggestions into one single commit, using the new feature from the Files changed tab, I think)