Fix Helm templating of the mutating/validating webhooks and namespaces

[vpedosyuk]

Fixes:

1. Dangerous MutatingWebhook for all "pod" resources that cannot be disabled in Helm values #90
2. install kruise version 1.5.0 with helm，cant set webhookConfiguration.failurePolicy.pods=Ignore  #74
3. maybe more

This PR basically fixes currently existing templating, doesn't change any defaults in values.yaml (but does apply some of them correctly now). See the changelog:
https://github.com/vpedosyuk/openkruise-charts/blob/1b4abe91a1662df8a5d84540986eca1e2afbfd4c/versions/kruise/1.6.0/Chart.yaml#L22-L45

To get a better view on the changes I run:

diff --recursive versions/kruise/1.5.2/ versions/kruise/1.6.0/

I've successfully tested it with minikube and the default values.yaml:

helm install kruise versions/kruise/1.6.0

as well as with overriden values:

installation:
  namespace: custom-ns
  createNamespace: true

featureGates: >-
  PodWebhook=false,
  KruiseDaemon=false

Additional changes:

1. When I tried running ct lint (from scripts/lint.sh) it failed due to the outdated configs so fixed some deprecated repo reference.
2. When I tried running ct lint (from scripts/lint.sh) it failed due to the empty maintainers field so disabled this check as this particular field is actually empty for all versions of the chart.

Checklist:

• I have bumped the chart version according to versioning
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.

Changes are automatically published when merged to master. They are not published on branches.

[kruise-bot]

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[kruise-bot]

Welcome @vpedosyuk! It looks like this is your first PR to openkruise/charts 🎉

[kruise-bot]

@vpedosyuk: PR needs rebase.

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