Add a PriorityClass Component (#133)

kustomization/components/priorityclass/README.md

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+# PriorityClass Component
+
+This sets up a number of common priority classes that are used in this repository.
+
+# Example Usage
+
+```yaml
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+components:
+  - https://github.com/marinatedconcrete/config/kustomization/components/priorityclass
+```

kustomization/components/priorityclass/application-infra.yml

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+---
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: application-infra
+value: 1001000

kustomization/components/priorityclass/application.yml

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+---
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: application
+value: 1000000

kustomization/components/priorityclass/critical-application-infra.yml

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+---
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: critical-application-infra
+value: 10001000

kustomization/components/priorityclass/critical-application.yml

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+---
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: critical-application
+value: 10000000

kustomization/components/priorityclass/kustomization.yml

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+---
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+
+resources:
+  - opportunistic.yml
+  - application.yml
+  - application-infra.yml
+  - critical-application.yml
+  - critical-application-infra.yml

kustomization/components/priorityclass/opportunistic.yml

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+---
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: opportunistic
+value: -1000000000

kustomization/tests/priorityclass/kustomization.yml

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+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+components:
+  - ../../components/priorityclass