Pull out the duplicate namespace definition to a separate 0-namespace.yaml file

[gyohuangxin]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR fixes duplicate namespace definition in config/webhook/certificate_config.yaml and config/webhook/admission_webhook.yaml. It pulls out the namespace definition to a separate 0-namespace.yaml file.

Which issue(s) this PR fixes:

Fixes #1374

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @gyohuangxin. Thanks for your PR.

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[robscott]

Thanks @gyohuangxin! Will leave final LGTM for someone else in case I missed anything with this proposed approach.

/ok-to-test
/approve

[gyohuangxin]

@robscott Thanks, got it.

[shaneutt]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gyohuangxin, robscott, shaneutt

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