treat amd64 the same as x86_64

[bwagner5]

Issue #, if available:
N/A

Description of changes:

• The EC2 API uses x86_64 to denote AMD64 architecture, but they are effectively the equivalent. Especially in the world of k8s, amd64 is used since golang uses amd64 as a GOARCH for building. In this PR, the selector pkg will accept x86_64 or amd64. If amd64 is passed in, it will be transformed when the rawFilters are executed to become x86_64 so that the EC2 API response matches.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #35 into master will decrease coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   90.05%   89.85%   -0.21%     
==========================================
  Files           8        8              
  Lines         875      877       +2     
==========================================
  Hits          788      788              
- Misses         57       58       +1     
- Partials       30       31       +1     

Impacted Files	Coverage Δ
pkg/selector/types.go	100.00% <ø> (ø)
pkg/selector/selector.go	84.50% <100.00%> (-0.81%)	⬇️

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[haugenj]

👍