AL2 Support for AWS Warm Pools

[eytan-avisror]

Adds to #277

TBD:

• Unit testing
• Documentation

[codecov]

Codecov Report

Merging #286 (0fddd04) into master (541ec27) will decrease coverage by 0.18%.
The diff coverage is 65.11%.

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
- Coverage   70.19%   70.00%   -0.19%     
==========================================
  Files          19       19              
  Lines        2979     3094     +115     
==========================================
+ Hits         2091     2166      +75     
- Misses        758      788      +30     
- Partials      130      140      +10     

Impacted Files	Coverage Δ
api/v1alpha1/zz_generated.deepcopy.go	0.00% <0.00%> (ø)
controllers/provisioners/eks/eks.go	88.63% <ø> (ø)
controllers/provisioners/eks/update.go	79.90% <14.28%> (-2.22%)	⬇️
api/v1alpha1/instancegroup_types.go	15.22% <31.81%> (+1.11%)	⬆️
controllers/provisioners/eks/upgrade.go	84.96% <77.27%> (-3.83%)	⬇️
controllers/provisioners/eks/helpers.go	91.37% <91.11%> (-0.02%)	⬇️
controllers/provisioners/config.go	77.10% <100.00%> (ø)

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[eytan-avisror]

33 scenarios (33 passed)
189 steps (189 passed)
31m12.218033102s
testing: warning: no tests to run
PASS
ok  	github.com/keikoproj/instance-manager/test-bdd	1872.780s [no tests to run]

[eytan-avisror]

@backjo can you review when you get a chance?

[eytan-avisror]

Thanks for the review @backjo, I addressed the comments

[backjo]

Looks good - this is going to be really exciting to use!