Allow webhook authorization

[sulochan]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Allows users to use webhook for authorization of api requests.

Which issue(s) this PR fixes:

Special notes for your reviewer:
None

Does this PR introduce a user-facing change?:

Users are able to use webhook authorization. Vars to turn this feature is provided
on the sample config.

[k8s-ci-robot]

Hi @sulochan. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[EppO]

some YAML to fix to pass CI:

./inventory/sample/group_vars/k8s-cluster/k8s-cluster.yml
  73:2      warning  missing starting space in comment  (comments)
  74:2      warning  missing starting space in comment  (comments)
  75:2      warning  missing starting space in comment  (comments)
  78:2      warning  missing starting space in comment  (comments)
  79:2      warning  missing starting space in comment  (comments)
  80:2      warning  missing starting space in comment  (comments)

[woopstar]

/ok-to-test

[mattymo]

This default(false) is redundant because the role defines a default. I understand the task above it is also to blame. Just pointing out a stylistic issue here.

[mattymo]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattymo, sulochan

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[mattymo]

/skip pull-kubespray-yamllint