[aws-load-balancer-controller]Add PodDisruptionBudget

[cw-sakamoto]

Signed-off-by: cw-sakamoto sakamoto@chatwork.com

Description of changes

Add Pod Disruption Budget template

Checklist

• Added/modified documentation as required (such as the README.md for modified charts)
• Incremented the chart version in Chart.yaml for the modified chart(s)
• Manually tested. Describe what testing was done in the testing section below
• Make sure the title of the PR is a good description that can go into the release notes

Testing

result with helm diff in our test cluster.

kube-system, aws-load-balancer-controller, PodDisruptionBudget (policy) has been added:
-
  1 awsLoadBalancerController:↲
+ # Source: aws-load-balancer-controller/templates/pdb.yaml
+ # Source: aws-load-balancer-controller/templates/pdb.yaml
+ apiVersion: policy/v1beta1
+ kind: PodDisruptionBudget
+ metadata:
+   name: aws-load-balancer-controller
+   labels:
+     helm.sh/chart: aws-load-balancer-controller-1.1.3
+     app.kubernetes.io/name: aws-load-balancer-controller
+     app.kubernetes.io/instance: aws-load-balancer-controller
+     app.kubernetes.io/version: "v2.1.1"
+     app.kubernetes.io/managed-by: Helm
+   namespace: kube-system
+ spec:
+   selector:
+     matchLabels:
+       app.kubernetes.io/name: aws-load-balancer-controller
+       app.kubernetes.io/instance: aws-load-balancer-controller
+   maxUnavailable: 1

result of describe during rolling update.

% kubectl describe pdb -n kube-system aws-load-balancer-controller
Name:             aws-load-balancer-controller
Namespace:        kube-system
Max unavailable:  1
Selector:         app.kubernetes.io/instance=aws-load-balancer-controller,app.kubernetes.io/name=aws-load-balancer-controller
Status:
    Allowed disruptions:  1
    Current:              2
    Desired:              1
    Total:                2
Events:                   <none>

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[cw-sakamoto]

@kishorj
Thank you for your maintenance of this chart. Please review this PR.

[fawadkhaliq]

++, thanks for your contribution!

cc: @Kishorb to take a final look

[kishorj]

Lets refer to the latest version - https://kubernetes-sigs.github.io/aws-load-balancer-controller/latest/deploy/configurations/