Refactoring/aws/elb

[misg]

This PR aims to migrate AWS ELB service to the new architecture, as part of #183.
Please note that I got rid of the elb policies since they weren't used anywhere.

[codecov-io]

Codecov Report

Merging #257 into refactoring/resource-configs will increase coverage by 0.35%.
The diff coverage is 46.03%.

@@                       Coverage Diff                        @@
##           refactoring/resource-configs     #257      +/-   ##
================================================================
+ Coverage                         31.32%   31.67%   +0.35%     
================================================================
  Files                               140      143       +3     
  Lines                              5784     5761      -23     
================================================================
+ Hits                               1812     1825      +13     
+ Misses                             3972     3936      -36

Impacted Files	Coverage Δ
ScoutSuite/providers/aws/provider.py	9.83% <ø> (+0.07%)	⬆️
...uite/providers/aws/resources/elb/load_balancers.py	26.08% <26.08%> (ø)
ScoutSuite/providers/aws/facade/elb.py	45.83% <45.83%> (ø)
ScoutSuite/providers/aws/configs/services.py	49.18% <50%> (ø)	⬆️
ScoutSuite/providers/aws/facade/facade.py	44.44% <50%> (+7.45%)	⬆️
ScoutSuite/providers/aws/resources/elb/service.py	83.33% <83.33%> (ø)
ScoutSuite/providers/aws/resources/elb/vpcs.py	83.33% <83.33%> (ø)
ScoutSuite/output/js.py	25% <0%> (-0.36%)	⬇️
... and 2 more

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[Aboisier]

Looks good! 💯