using base-overlay to support multi-infra

[intelliguy]

kustomize의 다수의 리소스를 합치는 기능을 활용하여 다양한 변형을 지원할수 있다.
tks-cluster를 만드는 부분에서 infra를 함께 선택하여 aws나 byoh에 적용가능하다. (kustomization.yaml 작성시 포함한다. 다음은 aws 예시)

$  cat cluster/kustomization.yaml
resources:
  - ../base
  - ../infra/aws

transformers:
  - site-values.yaml

다음 두 pr이 동시 merge되어야 함

• using base-overlay to support multi-infra decapod-site#92
• using base-overlay to support multi-infra #167
• using structured kustomize document on infra-selection tks-flow#105
• using structured kustomize document on infra-selection decapod-flow#96

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